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That review comes at a time when states have turned to pentobarbital due to a shortage of other lethal injection drugs.

A federal court appeal focuses on how Missouri injects the fatal dose of pentobarbital.

Pye, 59, is scheduled to be receive a lethal injection using the sedative pentobarbital.

Prison officials have said they get the sedative pentobarbital from a compounding pharmacy whose identity is shielded by state law.

Georgia executions are carried out at the state prison in Jackson by injection of the sedative pentobarbital.