A view inside Rhode Island's John J. Moran Medium Security Prison, in Cranston. Rhode Island is the only state to screen every individual who comes into the correctional system for opioid use disorder, and to offer, in conjunction with with counseling, all three medically effective treatments. Andrew Burton/Getty Images hide caption
Striking prison guards light a fire as they demonstrate in front of Villefranche-sur-Saone prison on Monday as part of a nationwide movement to call for improved safety and wages. Jeff Pachoud/AFP/Getty Images hide caption
In this June 18, 2015, photo, a prisoner walks near his crowded living area in Elmore Correctional Facility in Elmore, Ala. Tuesday's ruling comes in a class action lawsuit brought by inmates who argued the conditions violated the U.S. Constitution's ban on cruel and unusual punishment. Brynn Anderson/AP hide caption
An officer stands at the Fresnes Prison in France in September 2016. Fresnes was the first French prison to separate radicalized inmates from the general prison population. Patrick Kovarik/AFP/Getty Images hide caption
Martin Sostre on Feb. 12, 1976 — the same week he was released from prison after he was granted executive clemency by the governor of New York. Vic DeLucia/The New York Post via Getty Images hide caption
This Jan. 28, 2016 file photo shows a solitary confinement cell at New York City's Riker's Island jail. On March 31, 2016, a federal judge approved a sweeping plan to reduce solitary confinement in New York state prisons. Bebeto Matthews/AP hide caption
Keith Cole is one of the Texas inmates in the federal lawsuit challenging extreme heat in Texas prisons. John Burnett/NPR hide caption
Supporters of Egypt's ousted President Mohammed Morsi, a Muslim Brotherhood leader, chant slogans against the Egyptian military during a trial in which they were charged with violence in Alexandria, Egypt, on March 29, 2014. Thousands of Muslim Brotherhood supporters have been jailed by the current government. A former prisoner tells NPR he saw some turn to ISIS in prison. Heba Khamis/AP hide caption
Riot police were deployed Wednesday night outside Topo Chico prison in Monterrey, Mexico, where at least 52 people died in rioting and a fire. Francisco Cobos/AFP/Getty Images hide caption
Many federal inmates have access to email but defense attorneys say they don't trust it, because prosecutors have used those emails as evidence in court. Patrick George/Ikon Images/Getty Images hide caption
Federal regulators will vote on capping the cost of phone calls from prison, which are far more expensive than ordinary calls. iStockphoto hide caption
Inmates Ted Stancil (from left), Steven Bass and Christopher Peeples, with their welding Instructor Jeremy Worley (standing in center) at Walker State Prison in Georgia. The inmates are working toward a welding certificate. Susanna Capelouto/WABE hide caption
The plaintiffs in the case are inmates at Pelican Bay State Prison near Crescent City, Calif. "In the most severe cases," Juan Mendez says, indefinite solitary confinement — like that practiced at Pelican Bay — "can even be considered torture." Rich Pedroncelli/AP hide caption