FILE - This undated file photo provided by the Arkansas Department of Correction shows Kenneth Williams, who was executed with the use of the sedative midazolam on April 27, 2017, in Varner, Ark. During the execution, Williams' chest leaped forward against the leather restraint that secured him to the stainless steel gurney. Fifteen times came in quick succession, followed by five more at a slower pace. A coroner pronounced Williams dead 13 minutes after the execution began. Questions about whether midazolam can prevent prisoners from suffering while they die have persisted since several states in 2014 began using the drug as part of their lethal injection protocols. (Arkansas Department of Correction via AP, File)
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