A cell block at the now-closed Abu Ghraib prison in Baghdad, a facility notorious for photos released in 2004 showing U.S. soldiers torturing and humiliating inmates. Karim Kadim/AP hide caption

itoggle caption Karim Kadim/AP

Known by the nickname "Wall Street," Curtis Carroll teaches financial literacy at the San Quentin Prison, helping inmates prepare for life after incarceration. Carroll, however, is serving a life sentence. Courtest of The California Department of Corrections and Rehabilitation hide caption

itoggle caption Courtest of The California Department of Corrections and Rehabilitation

Latandra Ellington, 36, was serving time for tax fraud at Lowell Correctional Institution when she died. Florida Department of Corrections hide caption

itoggle caption Florida Department of Corrections

A Los Angeles County Department of Public Health worker shows condoms for weekly distribution to inmates in the Men's Central Jail. George Lavender hide caption

itoggle caption George Lavender

The Lafayette Parish Correctional Center in downtown Lafayette, La. By most counts, Louisiana has the highest incarceration rate in the country, but sentencing reformers have loosened some of the state's mandatory minimum sentences and made parole slightly easier to get. Denny Culbert for NPR hide caption

itoggle caption Denny Culbert for NPR