While Attorney Jeff Sessions is waging war on opioids , the Nevada Department of Corrections has secured fentanyl—a powerful opioid at the center of the crisis—to use in an upcoming execution.

Fentanyl will be used as part of a three-drug cocktail in addition to diazepam, which causes unconsciousness, and cisatracurium, which causes paralysis. This three-drug cocktail has never been used in an execution, and experts are concerned about its effectiveness.

"Use of these drugs could result in a botched execution, leading to torture or a lingering death in violation of the protections of the United States Constitution," ACLU of Nevada Executive Director Tod Story said in a statement.

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