WASHINGTON — The federal prison population is on the decline, but a new attorney general who talks tough on drugs and crime and already has indicated a looming need for private prison cells seems poised to usher in a reversal of that trend.

Jeff Sessions, a former federal prosecutor sworn in this month as the country's chief law enforcement officer, signaled at his confirmation hearing — and during private meetings in his first days on the job — that he sees a central role for the federal government in combating drug addiction and violence as well as in strict enforcement of immigration laws.

The result could be in an increase not only in the number of drug prosecutions brought by the Justice Department but also in the average length of sentence prosecutors pursue for even lower-level criminals. If that happens, the resources of a prison system that for years has struggled with overcrowding, but experienced a population drop as Justice Department leaders pushed a different approach to drug prosecutions, could be taxed again.

"Given the rhetoric coming out of the White House and the selection of Sessions as attorney general, an increase in the federal prison population and a chilling effect on state reforms is a very real possibility," said Inimai Chettiar, justice program director at the Brennan Center for Justice.

The approach by Session, a former Alabama senator, to drug crimes will matter in courtrooms across the country and also to the Justice Department's bottom line.

Nearly half of federal prisoners are in custody for drug offenses, and the Bureau of Prisons budget accounts for about one-third of the department's overall $29 billion spending plan. The population ballooned during the 1980s-era war on drugs as Congress abolished parole and as federal prosecutors relied on mandatory minimum sentences — rigid punishments strictly tied to drug quantity — to seek decades-long prison terms for drug criminals.

But in recent years, fiscal-minded Republicans, and Democrats pushing criminal justice efforts, have raised concerns about bloated prison costs and tried to develop ways to cut the population.

The Justice Department's inspector general has said mounting prison expenses detract from other programs and initiatives, and a 2014 Government Accountability Office report said overcrowding at bureau facilities had caused additional double- and triple-bunking, higher inmate-to-guard ratios and long waiting lists for educational programs.

The federal prison population now stands at just under 190,000, down from nearly 220,000 in 2013.

A number of factors contributed to the decline: Obama administration clemency grants to more than 1,700 inmates; decisions by the independent U.S. Sentencing Commission to reduce drug sentencing guidelines and apply the changes retroactively; and a 2013 Justice Department initiative known as "Smart on Crime," in which then-Attorney General Eric Holder directed prosecutors not to seek mandatory minimum sentences for nonviolent and low-level offenders.

Justice Department officials in the Obama administration say their efforts to shrink the prison population were driven not only by cost concerns but also by a desire to correct what they said were excessive punishments doled out by judges. They said last year that that while the number of drug prosecutions had fallen, the cases prosecutors were pursuing involved more serious crimes.


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