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.
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.
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.