Over the past 40 years, criminal justice policy in the U.S. was shaped by the belief that the best way to protect the public was to put more people in prison. Offenders, the reasoning went, should spend longer and longer time behind bars.

Consequently, offenders have been spending more time in prison. According to a new study by Pew’s Public Safety Performance Project, the length of time served in prison has increased markedly over the last two decades. Prisoners released in 2009 served an average of nine additional months in custody, or 36 percent longer, than offenders released in 1990.

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