Jim Chilton picks up a shoe left behind by an illegal border crosser on his property in Arivaca. Migrants hide under the branches of this oak tree to escape detection from Border Patrol helicopters.
Michael Montgomery, operations supervisor at the Tucson air branch with Customs and Border Protection’s Office of Field Operations and Air and Marine Operations, flies towards the U.S.-Mexico border in Arizona.
2014: A border patrol vehicle stands guard at a section of collapsed fence just west of the Mariposa Port of Entry after severe storms knocked down a chunk of the metal border fence. Runoff from the storms destroyed about 60 feet of fence and damaged homes just north of it.
Get a 360-degree view of border vehicle barriers at southwest Arizona's Organ Pipe National Monument. In remote stretches of the U.S.-Mexico border where people are unlikely to cross on foot, these barriers are intended to stop cars, but let large wildlife and flowing water through.
Arizona’s border with Mexico is desert, wetlands, jagged mountains and cities that depend on their neighbor to the south.
It has rivers that flow north, an Indian reservation the size of Connecticut and some of the nation’s largest and most remote wilderness areas.
About 70 percent of the state’s border is known as the Tucson Sector, which includes seven mountain ranges that reach thousands of feet high.
As Tucson Sector Border Patrol Chief Paul Beeson sees it, “Two hundred sixty-two miles might not sound like a lot, but when you get out there and you see the ruggedness, the mountain ranges, the dense brush, everything that goes on with this place — it is not a place without challenges.”
Apprehensions in the sector are the lowest they’ve been since 1991, but how many get through is unknown. Increased enforcement in the urban areas pushed traffic further into the punishing desert where there’s less fencing and the terrain itself is the international barrier.
As more fencing, agents and technology made it harder to smuggle through here, the lines dividing the human and drug trafficking businesses blurred. The Sinaloa Cartel, one of the world’s most notorious drug-trafficking rings, took control.
Residents of remote areas don’t see large groups trekking through anymore, nor loaded cars flying by. Now people cross a few at a time, often dressed in camouflage and wearing carpet booties to hide their tracks.
DAILY TRAFFIC
Francine Pearl Jose lives less than five miles from the border in the Tohono O’odham Reservation, southwest of Tucson.
Her closest neighbor is four miles away. Most of the time it’s just her and her nephew, looking after their cattle.
Ever since traffic started shifting to the western corridor in the mid-1990s, she says, her property has been overrun.
Initially, she says, there were “lots of cars. It was terrible because sometimes they’d be driving really fast.” They almost ran her elderly father off the road several times.
But that stopped when three types of border fence designed to stop vehicles went in on the Tohono O’odham Nation’s 75 miles of border with Mexico.
Now she mostly sees people walking though.
“When I came this morning I saw those bottles, a guy over here and Border Patrol on their bikes picking him up,” she says, pointing to two black water jugs tied with a rope right outside her house.
“Somebody comes out almost every day. It’s just something we are kind of used to.”
In the desert, agents find gas cans, spare tires and cement bags thrown out of cars that drive back and forth across the border — filled with hundreds of pounds of trash in one direction, then replaced with people or drugs in the other.
Arizona serves as the primary distribution hub for drugs throughout the United States. While most heroin and meth is smuggled through ports of entry, marijuana tends to come through the desert. The sector is responsible for half of the marijuana seized by the Border Patrol in the Southwest.
Jose points to her 40-foot-tall water tank behind her house as a possible culprit for the traffic.
“They probably see it and are told to follow it,” she says.
She doesn’t like guns, but she’s had to arm herself. Her house was constantly getting broken into until she put metal bars on the windows and installed an iron door.
A couple of times groups of men who seem to be high on something have jumped in the back of her pickup truck, wanting a ride south.
Nothing has ever happened to her family, but violent incidents with rip crews stealing from cartels are increasing. In May in a nearby district, a man involved in a clash between smugglers and a rip crew was shot twice in the knee.
SHIFTING TRENDS
It hasn’t always been like this. In the mid-’80s to early ‘90s, traffic was concentrated in places like El Paso and San Diego, where it was easy for people to cross and get on a highway.
The federal government decided to beef up enforcement in those areas and stop the flow. It worked — but at Arizona’s expense.
By the mid-’90s, Nogales agents were making more than 100,000 apprehensions a year. In the first months of fiscal 1996, agents in Douglas made 67,000 arrests — more than all the apprehensions last year in the entire Tucson Sector.
The response was to install tall pedestrian fencing near cities, where agents have minutes or seconds to catch crossers before they hop into a car or run into a house and out of sight.
As a result, smugglers fled to areas with less enforcement, and apprehensions and deaths soared in hot, desolate places like the Tohono O’odham Nation and public lands.
By 1998, the Tucson Sector was the busiest in the country.
Cars barreled through, scarring the sensitive environment. Mountains of trash piled up. Soon, thousands of agents were chasing crossers and creating new roads.
Ten years after the Secure Fence Act, which required the federal government to build up to 700 miles of border fence, 80 percent of all of Arizona’s border has some type of barrier.
Chest-high crossed steel was chosen for rural areas where loaded cars were the main concern. Cross-hatch Normandy fencing went up near rivers to allow the flow of water.
But the same terrain the government thought would deter people from attempting the journey has also made the border harder to fence and patrol. Sixty-six miles in Arizona — 50 in the Tucson Sector — have no barrier but barbed wire or mountains.
A RANCHER’S LIFE
Jim Chilton ranches 50,000 acres that include a remote stretch of the Arizona-Mexico border in the Altar Valley.
When he and his wife, Sue, are not in Washington testifying or meeting with members of Congress, they are out checking pastures and cattle. They regularly show members of the media the porous border near them.
Their house is a two-hour drive from the international line — only about 10 miles, but over steep, winding terrain and bad roads.
“I know every turn and twist,” the fifth-generation rancher says. “I’ve driven this road a thousand times.”
He drives to the spot where his ranch shares about five miles with Mexico. Less than a mile has Normandy barriers; the rest is a four-strand, barbed-wire cattle fence.
The fence stops west of the Mariposa Port of Entry, as it descends into a deep canyon. It restarts about 25 miles west near Sasabe.
There’s no cell reception here; even radio communication is spotty. A helicopter can hover above an agent and they can’t talk to each other.
Not far from here, Border Patrol agent Brian Terry was killed in 2010 in a remote canyon when his team came across a rip crew.
Chilton always carries a rifle and a shotgun.
“I have seen cartel scouts here and in that mountain over there watching us,” he says as he walks the last stretch to the border wearing boots, a cowboy hat and a black leather vest.
Ranchers around here tell of break-ins, finding marijuana bales on their property, running into druggers, as they call them — and of migrants in despair or already dead.
“Here are the binoculars that those druggers left,” Chilton says as he climbs out of his truck. “They were watching me with them.”
Despite all the encounters, he’s never had to use his rifle. The last thing traffickers want is the added attention brought by the killing of rancher, like what happened after Robert Krentz, from neighboring Cochise County, was shot six years ago. The case remains unsolved.
As Chilton sees it, agents should be closer to the border. A road should run east and west along the international line, which the Border Patrol’s Beeson says the agency is working on. Beeson notes that 75 percent of arrests in the Tucson Sector are within 20 miles of the border. It would take about 22,000 agents just for the Tucson Sector if they were all stationed right at the border, he says.
Chilton would like to see a wall to make it harder for drug mules to haul their loads, but he knows that alone won’t solve the problem.
His neighbor, Lyle Robinson, a rancher and local veterinarian, says he wants at least the vehicle barrier the Tohono O’odham reservation has.
“When they go from the border through my property, they cut four fences of mine,” he says. “I want a good fence that keeps our cattle in.”
Both ranchers want a forward-operating base, where agents sleepand work for days at a time right by the border. Chilton even proposed leasing the Border Patrol 10 acres for $1 a year.
The sector has four bases, and that’s all it needs for now, Beeson says. Besides, the lack of roads and infrastructure in that area doesn’t lend itself to a base.
The ranchers also want more technology at the border. There are several fixed cameras around the area, including one on Ruby Road not far from Chilton’s house, but all around are ridges and washes with thick vegetation.
“Look around you,” Chilton says. “Can they tell there’s anyone moving through that path? The cartels know exactly where to walk so the camera won’t see them.”
Beyond all that, area ranchers say they want a guest-worker program that lets migrants cross the line to work, and then head back home.
• Arizona is also the only state with its own $750 million technology plan
• Apprehensions are the lowest they’ve been in 25 years, but marijuana drug seizures remain the highest in the country.
• Patrolling the entire Tucson sector right at the border would take 22,000 agents.
INTERACTIVE MAP OF ARIZONA-MEXICO BORDER
RED LINE = FENCED AREAS
Drag to move along the border. Tap dots to learn more about key spots along the way.
VIEW FROM ABOVE
Above mountain ranges and vast, flat expanses, helicopters and unmanned aircraft work best.
“From up here I can see everything,” Michael Montgomery, an operations supervisor in the Tucson branch of Customs and Border Protection’s Air and Marine Operations, says as he flies over the reservation.
Earlier this summer, a helicopter spotted 10 men believed to be drug smugglers hiding on the side of a mountain in the western part of Organ Pipe Cactus National Monument. Without the helicopter, it would have taken hours for agents to trek up there.
Organ Pipe has towers, dozens of Border Patrol trucks and a forward-operating base close to the border, but the stretch between it and Cabeza Prieta Wildlife Refuge is one of the country’s most brutal and desolate.
Not far from here, 14 migrants were found dead in May 2001 on a day when the desert sands reached 130 degrees. They were 25 miles from the border; the nearest highway was 50 miles from where a smuggler abandoned them.
Last year, 15 bodies were recovered in Cabeza, also covered by the Yuma Sector, refuge manager Sid Slone says.
In some areas the border is only about a mile away, but as soon as you get out of the car and start walking, everything looks the same. There is no such thing as a quick walk as you sink knee-deep into the sand every few steps.
The climate is also deceptively ruthless. A cool breeze and some cloud cover quickly give way to sweltering heat.
One day in June, as triple-digit temperatures break records, all Customs and Border Protection branches — the Border Patrol, the Office of Field Operations, and Air and Marine Operations — work together to handle nearly a dozen 911 calls from people wanting to surrender and get help. Most come from the area north of Cabeza and Organ Pipe.
By that point, migrants have walked about 60 miles, just on the U.S. side. They often run out of food and water, unable to carry enough for the multi-day journey.
The success and status of the border fence may be up for debate, but most people here declare that vehicle barriers work.
“Some look at the vehicle barrier and say that’s not a fence,” Border Patrol sector chief Beeson says. “But what was the threat it was seeking to address? That was vehicles.”
In 2007, the sector had 1,344 vehicles that drove through the fence. That dropped to 58 last year.
It was a compromise, many say — a balance between border enforcement, the environment and tradition.
“We are starting to understand each other better,” Beeson says.
When the fence first went up in the San Bernardino Wildlife Refuge in Cochise County, contractors bulldozed a staging area when they had said they wouldn’t. They destroyed archaeological sites and installed a culvert in a stream channel with no regard for endangered species, a 2008 Department of Interior report said.
Now the Border Patrol has its own gate to make rounds inside the refuge.
“The idea is that if we can communicate with each other, we will come up with solutions that benefit everybody,” says Bill Radke, the refuge’s manager.
The refuge supported the idea of vehicle barriers along its three miles of border. “If there was no Border Patrol presence, this area really would be pounded,” Radke says.
U.S. Border Patrol horse unit
A.E. Araiza / Arizona Daily Star
US Border Patrol agent Bobbi Schad keeps an eye on two illegal border crossers as two more handcuffed crossers join the group outside Nogales, Ariz., on May 18, 2016. Watching from below the ridgeline is agent Eric Robles. The four men were first detected by cameras and sensors in the area. Then agents, relying on their mustangs and knowledge of the area are able to locate and capture the crossers. A.E. Araiza / Arizona Daily Star
Even as he searches for weapons, identification and contraband, Shawn Rodgers, with the US Border Patrol Horse Patrol unit, keeps his horse nearby by having the reins looped through his belt while detaining several crossers outside Nogales, Ariz., on May 18, 2016. This allows him to use both hands and if the horse spooks he can still maintain balance and grab the reins, he said. A.E. Araiza / Arizona Daily Star
Hampered by steep terrain, US Border Patrol agent Eric Robles, with the agency's Horse Patrol Unit, has trouble making contact with his radio during a routine ride in the steep hills outside Nogales, Ariz., on May 18, 2016. Robles and fellow agents use their horses, their knowledge of the area and technology to locate and capture those crossing into the country illegally. A.E. Araiza / Arizona Daily Star
US Border Patrol agent Bobbi Schad talks with Shawn Rodgers after a ride in the steep rolling hills outside Nogales, Ariz., on May 18, 2016. Combining 21st Century technology with an age-old form of transportation has proven effective in the area of border security. A.E. Araiza / Arizona Daily Star
The barn area at the US Border Patrol's Nogales Station was built using various materials left over from past projects in Nogales, Ariz., on May 18, 2016. The teams travel by trailer to various locations depending on best information at the time. And although times and technology have changed since the horse unit was created in 1924 it is proven to be a reliable tool. A.E. Araiza / Arizona Daily Star
US Border Patrol agent Justin Thatcher, with the agency's Nogales Horse Patrol unit, attends to a small mare named "Penny" while in Nogales, Ariz., on May 18, 2016. Penny was "seized" after a previous arrest. For the most part the horse unit relies on captured mustangs, mostly from the Bureau of Land Management, the unit is able to traverse terrain that is not easily accessible. A.E. Araiza / Arizona Daily Star
Spotters use the hills in the distance to assist illegal activities along the border outside Nogales by monitoring US Border Patrol movement said Shawn Rodgers, a Border Patrol agent outside Nogales, Ariz., on May 18, 2016. They keep an eye on border patrol activity and let others know when it is safe to cross, he said. A.E. Araiza / Arizona Daily Star
Saddles, blankets, bridles are neatly placed along a wall of the tack room as US Border Patrol agents get their mounts ready for the day at the agency's Horse Patrol unit in Nogales, Ariz., on May 18, 2016. Although times and technology have changed since the horse unit was created in 1924 it is proven to be a reliable tool. A.E. Araiza / Arizona Daily Star
Shawn Rodgers cleans the hooves of his horse, Mayhem, before heading out. Bobbi Schad, background, commands the mounted and ATV patrols in the Border Patrol’s Tucson Sector.
Shawn Rodgers, a supervisory Border Patrol agent with the Nogales Station Horse Patrol unit, carries his saddle as he and fellow US Border Patrol agents start their day in Nogales, Ariz., on May 18, 2016. Relying on captured mustangs, mostly from the Bureau of Land Management, the unit is able to traverse terrain that is not easily accessible, even on foot. A.E. Araiza / Arizona Daily Star
Shawn Rodgers, a supervisory Border Patrol agent with the Nogales Station Horse Patrol unit, talks on the phone after a ride in the steep outside Nogales, Ariz., on May 18, 2016. Although times and technology have changed since the horse unit was created in 1924 it is proven to be a reliable tool. A.E. Araiza / Arizona Daily Star
US Border Patrol agents Tim Cameron, background, Bobbi Schad, foreground, and Shawn Rodgers lead their horses to water at Community Wells outside Nogales, Ariz., on May 18, 2016. Relying on captured mustangs, mostly from the Bureau of Land Management, the unit is able to traverse terrain that is not easily accessible, even on foot.
The U.S. Border Patrol's Tucson Sector horse patrol, created in 1924, combines the Old West with 21st Century technology. Agents carefully track and corner suspects and go where vehicles can't.
U.S. Border Patrol horse unit
A.E. Araiza / Arizona Daily Star
US Border Patrol agent Bobbi Schad keeps an eye on two illegal border crossers as two more handcuffed crossers join the group outside Nogales, Ariz., on May 18, 2016. Watching from below the ridgeline is agent Eric Robles. The four men were first detected by cameras and sensors in the area. Then agents, relying on their mustangs and knowledge of the area are able to locate and capture the crossers. A.E. Araiza / Arizona Daily Star
U.S. Border Patrol horse unit
A.E. Araiza / Arizona Daily Star
Even as he searches for weapons, identification and contraband, Shawn Rodgers, with the US Border Patrol Horse Patrol unit, keeps his horse nearby by having the reins looped through his belt while detaining several crossers outside Nogales, Ariz., on May 18, 2016. This allows him to use both hands and if the horse spooks he can still maintain balance and grab the reins, he said. A.E. Araiza / Arizona Daily Star
U.S. Border Patrol horse unit
Photos by A.E. Araiza / Arizona Daily Star
Shawn Rodgers, a supervisory Border Patrol agent, looks for the best way out of a ravine so he can get better radio reception.
U.S. Border Patrol horse unit
A.E. Araiza / Arizona Daily Star
Hampered by steep terrain, US Border Patrol agent Eric Robles, with the agency's Horse Patrol Unit, has trouble making contact with his radio during a routine ride in the steep hills outside Nogales, Ariz., on May 18, 2016. Robles and fellow agents use their horses, their knowledge of the area and technology to locate and capture those crossing into the country illegally. A.E. Araiza / Arizona Daily Star
U.S. Border Patrol horse unit
A.E. Araiza / Arizona Daily Star
US Border Patrol agent Bobbi Schad talks with Shawn Rodgers after a ride in the steep rolling hills outside Nogales, Ariz., on May 18, 2016. Combining 21st Century technology with an age-old form of transportation has proven effective in the area of border security. A.E. Araiza / Arizona Daily Star
U.S. Border Patrol horse unit
A.E. Araiza / Arizona Daily Star
The barn area at the US Border Patrol's Nogales Station was built using various materials left over from past projects in Nogales, Ariz., on May 18, 2016. The teams travel by trailer to various locations depending on best information at the time. And although times and technology have changed since the horse unit was created in 1924 it is proven to be a reliable tool. A.E. Araiza / Arizona Daily Star
U.S. Border Patrol horse unit
photos by A.E. Araiza / Arizona Daily Star
Border Patrol agents Eric Robles, middle, and Tim Cameron watch as fellow agent Matt Eisenhauer attempts to qualify to ride with them.
U.S. Border Patrol horse unit
A.E. Araiza / Arizona Daily Star
Agent Tim Cameron’s horse, Gus, came from the state prison in Florence. Many of the horses are mustangs from the Bureau of Land Management.
U.S. Border Patrol horse unit
A.E. Araiza / Arizona Daily Star
US Border Patrol agent Justin Thatcher, with the agency's Nogales Horse Patrol unit, attends to a small mare named "Penny" while in Nogales, Ariz., on May 18, 2016. Penny was "seized" after a previous arrest. For the most part the horse unit relies on captured mustangs, mostly from the Bureau of Land Management, the unit is able to traverse terrain that is not easily accessible. A.E. Araiza / Arizona Daily Star
U.S. Border Patrol horse unit
A.E. Araiza / Arizona Daily Star
Spotters use the hills in the distance to assist illegal activities along the border outside Nogales by monitoring US Border Patrol movement said Shawn Rodgers, a Border Patrol agent outside Nogales, Ariz., on May 18, 2016. They keep an eye on border patrol activity and let others know when it is safe to cross, he said. A.E. Araiza / Arizona Daily Star
U.S. Border Patrol horse unit
A.E. Araiza / Arizona Daily Star
Saddles, blankets, bridles are neatly placed along a wall of the tack room as US Border Patrol agents get their mounts ready for the day at the agency's Horse Patrol unit in Nogales, Ariz., on May 18, 2016. Although times and technology have changed since the horse unit was created in 1924 it is proven to be a reliable tool. A.E. Araiza / Arizona Daily Star
U.S. Border Patrol horse unit
A.E. Araiza / Arizona Daily Star
Shawn Rodgers cleans the hooves of his horse, Mayhem, before heading out. Bobbi Schad, background, commands the mounted and ATV patrols in the Border Patrol’s Tucson Sector.
U.S. Border Patrol horse unit
A.E. Araiza / Arizona Daily Star
Shawn Rodgers, a supervisory Border Patrol agent with the Nogales Station Horse Patrol unit, carries his saddle as he and fellow US Border Patrol agents start their day in Nogales, Ariz., on May 18, 2016. Relying on captured mustangs, mostly from the Bureau of Land Management, the unit is able to traverse terrain that is not easily accessible, even on foot. A.E. Araiza / Arizona Daily Star
U.S. Border Patrol horse unit
A.E. Araiza / Arizona Daily Star
Shawn Rodgers, a supervisory Border Patrol agent with the Nogales Station Horse Patrol unit, talks on the phone after a ride in the steep outside Nogales, Ariz., on May 18, 2016. Although times and technology have changed since the horse unit was created in 1924 it is proven to be a reliable tool. A.E. Araiza / Arizona Daily Star
U.S. Border Patrol horse unit
A.E. Araiza / Arizona Daily Star
US Border Patrol agents Tim Cameron, background, Bobbi Schad, foreground, and Shawn Rodgers lead their horses to water at Community Wells outside Nogales, Ariz., on May 18, 2016. Relying on captured mustangs, mostly from the Bureau of Land Management, the unit is able to traverse terrain that is not easily accessible, even on foot.
U.S. Border Patrol horse unit
A.E. Araiza / Arizona Daily Star
Agents Eric Robles, middle, and Shawn Rodgers approach border crossers they chased down on horseback.
Organ Pipe is often touted as an example of what happens when agencies work together.
In 2014, for the first time in more than a decade, visitors to Organ Pipe Cactus National Monument were able use the 330,000 acres that make up one of the most biologically diverse protected areas in the region. Portions of the park were closed after a ranger was killed in 2002 by a man fleeing Mexican police.
In 2001, the park seized 14,000 pounds of marijuana, up from fewer than 1,000 pounds in 1997.
Part of the solution was a nearly $40 million project to build 30 miles of 3-foot-high vehicle barriers and five miles of a 15-foot-tall pedestrian fence. Staffing at the park and the nearby Border Patrol station also increased. And now there are sensors, mobile surveillance trucks and fixed camera towers.
Although traffic gets through, that pretty much stopped the loaded cars and there have been no incidents involving visitors.
There are still plenty of complaints. Agents speed, they create new roads, they don’t fully understand the sensitive areas where they work.
As a result, some ranchers restricted agents’ access to their private lands. At John Ladd’s 16,000-acre ranch in the Naco area, which shares 10 miles of border with Mexico, agents can use 37 miles of road, but over the years that has created a lot of damage, Ladd says.
“I spend half of my time checking to make sure the fence hasn’t been cut and the cattle is where it needs to be,” he says. Challenges come from both the Border Patrol and illegal traffic.
But things are getting better, he says. The agency is telling agents to watch their speed and is working on improving the complaint process, Beeson says. Liaisons work with ranchers, public land managers and the community at large.
SOME STILL GET THROUGH
The fence hasn’t stopped people from going under, over or through it. In fiscal 2010 alone, the government spent more than $7 million to repair about 4,000 breaches to the fence.
Smugglers have also gotten creative, using catapults to launch marijuana packs across the border, flying drugs over in ultralight aircrafts and drones, molding bundles into footballs or long tubes that can slip between the 4-inch slats of the fence. They’ve even zip-lined marijuana across the border using the lighting system at a baseball field in Douglas.
Within three days after the Normandy-type barrier went up in the San Bernardino Wildlife Refuge, drug smugglers began cutting off portions and lifting them to let loaded cars through, using a new system of all-weather roads constructed by the Department of Homeland Security.
Tucson Sector Border Patrol agents have found more than 115 tunnels since the first one was discovered in 1990 in Douglas — 110 in the Nogales area alone.
And a recent video of two young men climbing the 20-foot-high fence in Nogales within seconds while a TV crew recorded it was a reminder of how easily it can be done.
“We have all of it. We have cameras, sensors, radars, we have a road,” rancher Ladd says. “But until the Border Patrol is allowed to patrol the border, it’s going to be the same problem.”
The agency is spending $45 million to replace 7.5 miles of old landing-mat fencing in the Naco area, where smugglers regularly pass.
Mother Nature also poses a challenge. In 2013, part of a steel fence in Nogales was knocked down by debris after a heavy rainstorm. The cost to clean up and repair the 600 feet of rebar-reinforced fencing was $730,000, The Associated Press reported.
Shortly after the pedestrian fence was built at Organ Pipe near Lukeville, a summer storm dumped up to 2 inches of rain. The 15-foot-tall wire-mesh panels had drainage crossing with gates, but it still flooded and damaged a nearby store, a government office and private property on both sides.
Again in 2011, the gates were not raised and a 40-foot stretch of mesh fencing was knocked over by rainwater rushing through a wash. The gates were part of a $24 million drainage improvement project along the U.S.-Mexico border in 2010.
Thinking a wall can overcome all that is just not realistic, say even some people who think the border is too open. You can’t build a wall and not patrol it,” says Ladd, who supports Donald Trump. “The misconception, from my opinion, is that the wall is a stand-all answer to everything.”
Francisco Obeso, 13, leaps to try and save a shot along Avenida Captain Carlos G. Calles just south of the international border fence in San Luis Rio Colorado, Sonora, Mexico.
Vehicle barrier, or "Normandy" fencing, lines the U.S.-Mexico border in the San Pedro River National Conservation Area inside Arizona's Coronado National Memorial park.
Jim Chilton, 77, grazes his cattle on 50,000 acres in Arivaca, Arizona. He often finds trash left behind by border crossers — clothing, plastic bags, cans of food and water bottles. Drug smugglers cut across his land to make drops of marijuana.
Arivaca rancher Jim Chilton opens a cowboy gate that is the U.S.-Mexico border on the Tres Bellotas Ranch. Ranchers install these gates so that when border crossers and drug smugglers come through, they open and close the gate rather than cutting the fence, which can lead to cattle wandering across the border.
Rancher Jim Chilton picks up a shoe left by a border crosser on his ranch in Arivaca, Arizona. On this part of his 50,000 acre ranch, migrants hide under the branches of this oak tree to escape detection from U.S. Border Patrol helicopters above.
Jim and Sue Chilton keep a collection of carpet shoes they find on their ranch in Arivaca, Arizona. Drug and people smugglers wear these shoes to keep their footprints from showing up in the desert.
Plastic bottles, cans and other items are left under an oak tree on the property of Arivaca rancher Jim Chilton. By the time border crossers arrive here, they will have been walking for about six hours, just on the U.S. side.
Jessie Frisby, right, teaches her students the song they will perform for their mother's as part of a Mother's Day concert at Cri-Cri Kindergarten school in Agua Prieta, Sonora, Mexico.
Students at Cri-Cri Kindergarten do the motions to a song during their school day in Agua Prieta, Sonora, Mexico. The school is one block from the U.S.-Mexico border.
Maria Sara Moreno, owner and director of Cri-Cri Kindergarten in Agua Prieta, Sonora, gets a group hug from her kindergartners. The school is one block from the U.S.-Mexico border. Moreno started the school in 1974 with one room. She teaches the kids English so they can attend schools in the United States if their families wish.
Border Patrol agents bring a suspected drug smuggler into custody after a group was spotted on a mountain range near the border at Organ Pipe Cactus National Monument and Cabeza Prieta National Wildlife Refuge southwest of Ajo, Arizona.
A deer passes through from Mexico into the United States through the vehicle barrier, or "Normandy" fencing, in the San Pedro River National Conservation Area inside the Coronado National Memorial park in Arizona. The vehicle barriers are used so wildlife can cross freely.
Ophelia Rivas, 59, pulls back a fence at her home near the U.S.-Mexico border fence on the O'odham Community of Ali Jegk in Arizona. Rivas and other residents post signs to try and keep the U.S. Border Patrol of coming onto their property.
Light fixures burn all night over the triple-fence zone along Avenida Captain Carlos G. Calles, just south of the international border fence in San Luis Rio Colorado, Sonora, Mexico.
Tribal members can cross back and forth through the San Miguel gate on the Tohono O'odham Nation without having to go through a port of entry. A U.S. Border Patrol agent is on site 24 hours a day to check tribal identifications and cars passing through.
The desert and mountainous terrain can be difficult for illegal border crossers to walk through near Arivaca, Arizona. In some of these areas, there is no border fence.
Border Patrol agents shield their faces as a Customs and Border Protection helicopter takes off to ferry suspected drug traffickers to be taken into custody along Bates Well Road, southwest of Ajo, Arizona.
Michael Montgomery, operations supervisor at the Tucson air branch with the Air and Marine Operations, U.S. Customs and Border Protection, flies towards the U.S.-Mexico border in Arizona.
Carmen Diaz, 47, a neighbor of Catalina Ortega, 66, left, and Antonio Ferrez Salazar, 11, right, holds a flower petal to get her dog's attention while the trio visit one afternoon along Avenida Captain Carlos G. Calles, just south of the international border fence in San Luis Rio Colorado, Sonora, Mexico.
A man is framed in the fence of a home along Avenida Captain Carlos G. Calles, just south of the U.S.-Mexico border fence in San Luis Rio Colorado, Sonora, Mexico.
The U.S.-Mexico border fence halts at an irrigation canal along Avenida Captain Carlos G. Calles, just south of the international border fence in San Luis Rio Colorado, Sonora, Mexico.
Francisco Valenzuela Sr. presents his tribal identification to U.S. Border Patrol agent Carlos Ortiz, before crossing back into Mexico through the San Miguel gate on the Tohono O'odham Nation on Thursday June 02, 2016. Valenzuela says he crosses into the United States twice a week to bring water, food and other supplies back to his home. GPS: 31 33' 16.4" N -111 46' 13.2" W
Vehicle barriers line the U.S.-Mexico border in San Bernardino Wildlife Refuge in Douglas, Arizona. The barriers were installed in 2008 by the U.S. Department of Homeland Security.
Sid Slone, left, manager of the Cabeza Prieta National Wildlife Refuge, talks with Roger McManus as they look over a map of the refuge west of Ajo, Arizona.
Roger McManus, president of the Friends of the Sonoran Desert, examines a tire drag used by Border Patrol to clear dirt roads so signs like footprints appear more clearly in Organ Pipe Cactus National Monument, just east of Lukeville, Arizona.
A border monument marks the U.S.-Mexico border in Agua Prieta, Sonora, Mexico. The cross honors migrants who have died while trying to cross into the United States.
The U.S.-Mexico border fence is comprised of a post-and-rail vehicle barrier on the right, and grate pedestrian fence as it ascends a hill near Puerto Blanco Drive in the Organ Pipe Cactus National Monument west of Lukeville, Ariz. Latitude: 31.893883 | Longitude: -112.861304
William Radke, refuge manager with the U.S. Fish and Wildlife Service, sits on a rail that is the U.S.-Mexico border in San Bernardino Wildlife Refuge in Douglas, Ariz. Mexico is behind him.
This 18-foot-high bollard border fence was built in 2008 inside the Coronado National Memorial park in Arizona. A gate was put in for access to the south side of the park in case of a wildfire or another emergency.
Joshua Guerrero, 11, uses a homemade periscope to peer through the U.S.-Mexico pedestrian fence along Avenida Captain Carlos G. Calles, just south of the international border fence in San Luis Rio Colorado, Sonora, Mexico.
Glenn Spencer, a longtime advocate of tougher immigration laws, receives small flags from across the United States to be placed on his own wall near the U.S.-Mexico border fence.
With balloons and fruit snacks in hand, a family walks past a line of vehicles queued to enter the United States just east of the port of entry in San Luis Rio Colorado, Sonora, Mexico.
Glenn Spencer built this wall about five years ago after someone pulled an American flag off of a pole he had put up near his property. Over the years people have sent him small flags to post on his walls — they spell out, "Secure the Border First" and, "America."
Beyond the Wall: Arizona's border with Mexico in photos.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
Rancher Tony Sedgwick, left, chats with a man he saw sitting on the ground just on the Mexican side of the international border west of Nogales, Ariz.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
Francisco Obeso, 13, leaps to try and save a shot along Avenida Captain Carlos G. Calles just south of the international border fence in San Luis Rio Colorado, Sonora, Mexico.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Vehicle barrier, or "Normandy" fencing, lines the U.S.-Mexico border in the San Pedro River National Conservation Area inside Arizona's Coronado National Memorial park.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Rene Nunez, 56, can see the U.S.-Mexico border fence from the front porch of his home in Douglas, Arizona.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
A Border Patrol agent parks on a hill looking into Mexico near the international border fence in Nogales, Arizona.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
A Border Patrol agent drags a device comprised of old tires and a metal rake-like assembly to smooth a Duquesne Road, northwest of Lochiel, Arizona.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Jim Chilton, 77, grazes his cattle on 50,000 acres in Arivaca, Arizona. He often finds trash left behind by border crossers — clothing, plastic bags, cans of food and water bottles. Drug smugglers cut across his land to make drops of marijuana.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Arivaca rancher Jim Chilton opens a cowboy gate that is the U.S.-Mexico border on the Tres Bellotas Ranch. Ranchers install these gates so that when border crossers and drug smugglers come through, they open and close the gate rather than cutting the fence, which can lead to cattle wandering across the border.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Rancher Jim Chilton picks up a shoe left by a border crosser on his ranch in Arivaca, Arizona. On this part of his 50,000 acre ranch, migrants hide under the branches of this oak tree to escape detection from U.S. Border Patrol helicopters above.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Jim and Sue Chilton keep a collection of carpet shoes they find on their ranch in Arivaca, Arizona. Drug and people smugglers wear these shoes to keep their footprints from showing up in the desert.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Plastic bottles, cans and other items are left under an oak tree on the property of Arivaca rancher Jim Chilton. By the time border crossers arrive here, they will have been walking for about six hours, just on the U.S. side.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
The international border, with Mexico on the right, as seen west of Lochiel, Arizona.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
The ghost town of Lochiel, Arizona, still boasts a few inhabitants.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
The international border fence transitions from pedestrian barrier to vehicle barrier west of Nogales, Arizona.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Jessie Frisby, right, teaches her students the song they will perform for their mother's as part of a Mother's Day concert at Cri-Cri Kindergarten school in Agua Prieta, Sonora, Mexico.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Students at Cri-Cri Kindergarten do the motions to a song during their school day in Agua Prieta, Sonora, Mexico. The school is one block from the U.S.-Mexico border.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Maria Sara Moreno, owner and director of Cri-Cri Kindergarten in Agua Prieta, Sonora, gets a group hug from her kindergartners. The school is one block from the U.S.-Mexico border. Moreno started the school in 1974 with one room. She teaches the kids English so they can attend schools in the United States if their families wish.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
Horses graze in a field in Lochiel, Arizona.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
A sign in Arivaca warns travelers of encounters with border-crossers. Smugglers carry marijuana to drop-off points and walk back into Mexico.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
Border Patrol agents bring a suspected drug smuggler into custody after a group was spotted on a mountain range near the border at Organ Pipe Cactus National Monument and Cabeza Prieta National Wildlife Refuge southwest of Ajo, Arizona.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
A deer passes through from Mexico into the United States through the vehicle barrier, or "Normandy" fencing, in the San Pedro River National Conservation Area inside the Coronado National Memorial park in Arizona. The vehicle barriers are used so wildlife can cross freely.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
Rancher Tony Sedgwick leans over the vehicle barriers marking the international border as he reads a boundary monument near Lochiel, Arizona.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
The U.S.-Mexico border fence at the San Miguel gate can be seen from above near Sells, Arizona. Mexico is at the top of the image.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
The moon rises in the distance as seen from Ajo, Arizona.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Ophelia Rivas, 59, pulls back a fence at her home near the U.S.-Mexico border fence on the O'odham Community of Ali Jegk in Arizona. Rivas and other residents post signs to try and keep the U.S. Border Patrol of coming onto their property.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
Light fixures burn all night over the triple-fence zone along Avenida Captain Carlos G. Calles, just south of the international border fence in San Luis Rio Colorado, Sonora, Mexico.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Tribal members can cross back and forth through the San Miguel gate on the Tohono O'odham Nation without having to go through a port of entry. A U.S. Border Patrol agent is on site 24 hours a day to check tribal identifications and cars passing through.
U.S. Border Patrol horse unit
Photos by A.E. Araiza / Arizona Daily Star
Shawn Rodgers, a supervisory Border Patrol agent, looks for the best way out of a ravine so he can get better radio reception.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
The desert and mountainous terrain can be difficult for illegal border crossers to walk through near Arivaca, Arizona. In some of these areas, there is no border fence.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
A portion of the U.S.-Mexico border fence ends in Nogales, Arizona., seen from the U.S. side.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Concrete barriers form the border fence west of Naco, Arizona.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
Border Patrol agents shield their faces as a Customs and Border Protection helicopter takes off to ferry suspected drug traffickers to be taken into custody along Bates Well Road, southwest of Ajo, Arizona.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Michael Montgomery, operations supervisor at the Tucson air branch with the Air and Marine Operations, U.S. Customs and Border Protection, flies towards the U.S.-Mexico border in Arizona.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
Carmen Diaz, 47, a neighbor of Catalina Ortega, 66, left, and Antonio Ferrez Salazar, 11, right, holds a flower petal to get her dog's attention while the trio visit one afternoon along Avenida Captain Carlos G. Calles, just south of the international border fence in San Luis Rio Colorado, Sonora, Mexico.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
The U.S.-Mexico border fence can be seen from above near Sells, Arizona. The United States is on the left and Mexico is on the right.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Francine Pearl Jose makes fry bread in her outdoor kitchen at her home on the Tohono O'odham Nation.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
A man is framed in the fence of a home along Avenida Captain Carlos G. Calles, just south of the U.S.-Mexico border fence in San Luis Rio Colorado, Sonora, Mexico.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Glenn Spencer receives small flags from people across the United States to be placed on his own wall that is built near the U.S.-Mexico border fence.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
A vehicle passes by on the Mexican side of the U.S.-Mexico border fence at Organ Pipe Cactus National Monument just east of Lukeville, Arizona.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Hermelinda Acosta, 74, lives a block from the U.S.-Mexico border in Douglas, Arizona.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
The U.S.-Mexico border fence ends in a mountain range in the O'odham Community of Ali Jegk in Arizona.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
A Border Patrol truck perches on a hilltop just north of the Buenos Aires neighborhood across the border in Nogales, Sonora.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Border monument #161 stands on the Mexico side of the fence in the Tohono O'odham community of Ali Jegk.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
The U.S.-Mexico border fence halts at an irrigation canal along Avenida Captain Carlos G. Calles, just south of the international border fence in San Luis Rio Colorado, Sonora, Mexico.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
The U.S.-Mexico border stretches across the mountains outside Nogales, Arizona.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Francisco Valenzuela Sr. presents his tribal identification to U.S. Border Patrol agent Carlos Ortiz, before crossing back into Mexico through the San Miguel gate on the Tohono O'odham Nation on Thursday June 02, 2016. Valenzuela says he crosses into the United States twice a week to bring water, food and other supplies back to his home. GPS: 31 33' 16.4" N -111 46' 13.2" W
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Vehicle barriers line the U.S.-Mexico border in San Bernardino Wildlife Refuge in Douglas, Arizona. The barriers were installed in 2008 by the U.S. Department of Homeland Security.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
Sid Slone, left, manager of the Cabeza Prieta National Wildlife Refuge, talks with Roger McManus as they look over a map of the refuge west of Ajo, Arizona.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
A rancher on the Sonoran side of the international border uses the boundary fence for pens and corrals near Lochiel, Arizona.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
Roger McManus, president of the Friends of the Sonoran Desert, examines a tire drag used by Border Patrol to clear dirt roads so signs like footprints appear more clearly in Organ Pipe Cactus National Monument, just east of Lukeville, Arizona.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
Cattle graze near a stretch of the international border fence comprised of vehicle barriers and barbed-wire fence west of Lochiel, Arizona.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
A border monument marks the U.S.-Mexico border in Agua Prieta, Sonora, Mexico. The cross honors migrants who have died while trying to cross into the United States.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
An old chapel rests on a hill behind mesquite trees in Lochiel, Arizona.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
A sign marks the U.S.-Mexico border fence on the Tohono O'odham Nation.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
A U.S. Border Patrol agent sits on top of a hill along the U.S.-Mexico border fence in Nogales, Arizona.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
The waters of Quitobaquito Springs in Organ Pipe Cactus National Monument southwest of Ajo, Arizona.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
The U.S.-Mexico border fence seen from above Nogales, Arizona. The United States in sn the left and Mexico is on the right.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
The U.S.-Mexico border fence is comprised of a post-and-rail vehicle barrier on the right, and grate pedestrian fence as it ascends a hill near Puerto Blanco Drive in the Organ Pipe Cactus National Monument west of Lukeville, Ariz. Latitude: 31.893883 | Longitude: -112.861304
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Rene Nunez's front porch in Douglas, Arizona, looks directly at the U.S.-Mexico border fence.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
William Radke, refuge manager with the U.S. Fish and Wildlife Service, sits on a rail that is the U.S.-Mexico border in San Bernardino Wildlife Refuge in Douglas, Ariz. Mexico is behind him.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
United States Border Patrol agents pull over two men driving along the U.S.-Mexico border fence in Nogales, Arizona.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
This 18-foot-high bollard border fence was built in 2008 inside the Coronado National Memorial park in Arizona. A gate was put in for access to the south side of the park in case of a wildfire or another emergency.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
Joshua Guerrero, 11, uses a homemade periscope to peer through the U.S.-Mexico pedestrian fence along Avenida Captain Carlos G. Calles, just south of the international border fence in San Luis Rio Colorado, Sonora, Mexico.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Glenn Spencer, a longtime advocate of tougher immigration laws, receives small flags from across the United States to be placed on his own wall near the U.S.-Mexico border fence.
2016 Border Project: Arizona
Mike Christy / Arizona Daily Star
With balloons and fruit snacks in hand, a family walks past a line of vehicles queued to enter the United States just east of the port of entry in San Luis Rio Colorado, Sonora, Mexico.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Children play on a trampoline in the front yard of a house just one block away from the U.S.-Mexico border in Douglas, Arizona.
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
Glenn Spencer built this wall about five years ago after someone pulled an American flag off of a pole he had put up near his property. Over the years people have sent him small flags to post on his walls — they spell out, "Secure the Border First" and, "America."
2016 Border Project: Arizona
Mamta Popat / Arizona Daily Star
A U.S. Border Patrol agent drives along the U.S.-Mexico border fence. Mexico is on the right.