Chess players score a game at the facility. Keith O'Brien for NPR hide caption

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Inmates walk past correctional officers at the Washington Corrections Center in Shelton, Wash., on Feb. 17, 2011. Gov. Jay Inslee said last month that more than 3,000 prisoners in Washington have been mistakenly released early since 2002 because of an error by the state's Department of Corrections. Elaine Thompson/AP hide caption

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David Carlson served two tours in Iraq while in the military. Courtesy of David Carlson hide caption

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Leahya Ellis and other spinning class participants use exercise as a way to shake away stress, anger and depression. Bastiaan Slabbers for NPR hide caption

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Former Peanut Corporation of America President Stewart Parnell was sentenced to 28 years in prison for knowingly shipping salmonella-tainted peanut butter, which was linked to the deaths of nine people. Don Petersen/AP hide caption

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Inmates talk with professors about how to teach classes in the Inside-Out program, where half the students are prisoners and half are traditional college students. Gabrielle Emanuel/NPR hide caption

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A part of Eastern State Penitentiary in Philadelphia is shown in 2008. The penitentiary opened in 1829, closed in 1971, and then historic preservationists reopened it to the public for tours in 1994. Matt Rourke/AP hide caption

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Curtis Carroll — also known as "Wall Street" — teaches prisoners at San Quentin State Prison about stocks. The Kitchen Sisters hide caption

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President Obama visited the El Reno Federal Correctional Institution in El Reno, Okla., on Thursday as part of a weeklong focus on inequities in the criminal justice system. While there, he met with non-violent drug offenders. Evan Vucci/AP hide caption

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