The state has used compoundedpentobarbital in its last two executions.
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Clark said Yowell was the first inmate in Texas to be executed using compoundedpentobarbital, a barbiturate.
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Missouri in November also used a compoundedpentobarbital, a short-acting barbiturate, to execute serial killer Joseph Paul Franklin.
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U.S. District Judge Henry Wingate issued a preliminary injunction last August barring Mississippi's corrections department from executing prisoners using compoundedpentobarbital or midazolam.
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In October, the state changed its protocols to allow for a compoundedpentobarbital, a short-acting barbiturate, to be used in a lethal dose for executions.