Two Oklahoma death row inmates are challenging the constitutionality of the law allowing the state to keep secret its source of lethal injection drugs.

According to the lawsuit filed Wednesday in Oklahoma County District Court, Clayton Lockett and Charles Warner have reason to believe Oklahoma’s execution method carries with it “a substantial risk of inflicting severe pain,” which would violate their constitutional rights against cruel and unusual punishment.

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Source: The Oklahoman, Feb. 27, 2014