America's 'inexorably' botched executions - BBC News

Originally proposed by an Oklahoma coroner, the conventional system consists of three drugs - an anaesthetic to relieve consciousness and pain, a paralytic to prevent movement, and a drug to stop the heart, causing death. But it does not always go smoothly. It was after Oklahoma inmate Clayton Lockett took 40 minutes to die in May that President Barack Obama directed the attorney general to review how the death penalty is applied.

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