In this photo taken on Tuesday, Dec. 29, 2015, a guard checks identification of a person leaving the east gate of San Quentin State Prison in a vehicle in San Quentin, Calif. With California’s lethal injection protocol in limbo, the nearly 750 inmates at San Quentin State Prison, the nation’s most populous death row, are more likely to die from natural causes or suicide than execution. The inmates await a final decision on a proposed one-drug execution method and the possibility that voters in 2016 will scrap the death penalty altogether. (AP Photo/Ben Margot)

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