Marvin Caldwell, 63, who said he was imprisoned for 20 years under the three strikes law for possession and sale of methamphetamine, looks out of his cell at San Quentin state prison in San Quentin, California, June 8, 2012. San Quentin prison is California's oldest correctional facility and houses the state's only gas chamber. Picture taken June 8, 2012. REUTERS/Lucy Nicholson (UNITED STATES - Tags: CRIME LAW SOCIETY TPX IMAGES OF THE DAY)

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