Oklahoma governor signs bill allowing nitrogen in executions

" Oklahoma became the first U.S. state to approve nitrogen gas for executions under a measure the state's Republican governor signed into law Friday that provides an alternative death penalty method if lethal injections aren't possible, either because of a court ruling or a drug shortage. Executions are on hold in Oklahoma while the U.S. Supreme Court considers whether the state's current three-drug method of lethal injection is constitutional.

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