Oklahoma has long used a three-drug protocol for executions. The first drug, a barbiturate, is intended to induce a state of unconsciousness. The second drug, a paralytic, is intended to paralyze the inmate and stop breathing. The third drug, potassium chloride, is intended to stop the heart.
In 2009, Oklahoma began using a three-drug protocol consisting of sodium thiopental, pancuronium bromide, and potassium chloride. In 2010, after the sole American manufacturer of sodium thiopental announced that it would no longer produce the drug, Oklahoma began using pentobarbital in place of sodium thiopental. In 2013, after that manufacturer also ceased production of pentobarbital, Oklahoma announced that it would use midazolam in place of the barbiturate.
On January 15, 2014, Oklahoma executed Charles Warner using the new protocol. Warner had filed a §1983 action challenging the constitutionality of Oklahoma’s lethal injection protocol, but the District Court denied his motion for a preliminary injunction, and the Court of Appeals for the Tenth Circuit affirmed. On the day of Warner’s execution, petitioners, all Oklahoma death row inmates, filed a §1983 action in federal district court. They contended that the use of midazolam in Oklahoma’s execution protocol violates the Eighth Amendment because it is incapable of rendering a person insensate to pain.
In December 2014, after discovery, the District Court held a 3-day evidentiary hearing on the preliminary injunction motion. The District Court denied the motion for a preliminary injunction. The Court of Appeals for the Tenth Circuit affirmed. Oklahoma executed Warner on January 15, 2015, but the Supreme Court subsequently stayed the executions of Glossip, Cole, and Grant pending the resolution of this case.
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