Alabama will not be ready to use nitrogen hypoxia to execute a death row inmate by Sept. 22, the date of its next scheduled execution, Alabama Department of Corrections Commissioner John Hamm said in an affidavit filed in federal court today.

“The ADOC cannot carry out an execution by nitrogen hypoxia on September 22, 2022,” the affidavit states.

The only other statement in the affidavit, other than Hamm’s declaration of sound mind, says, “The ADOC remains ready to carry out (Alan Eugene Miller’s) sentence by lethal injection on September 22, 2022.”

Nitrogen hypoxia — sometimes called nitrogen suffocation or nitrogen asphyxiation — has never been used to execute a human being. Alabama is one of only three states to have authorized its use in capital punishment, none of which have released a protocol for how they would perform an execution by nitrogen hypoxia.

The announcement comes two days after a federal judge ordered that the relevant public officials answer definitively by Thursday at 5 p.m. whether the state has the means and ability to use nitrogen hypoxia to execute Alan Eugene Miller on Sept. 22.

Miller, 57, has asked the court to stay his execution by lethal injection, arguing that the state lost the form he says he submitted in 2018 electing nitrogen hypoxia as his preferred method of execution.

During a hearing in Miller’s case on Monday, a state attorney indicated the state was nearing finalization of a protocol for a nitrogen hypoxia execution. James Houts, a deputy state attorney general who is representing ADOC Commissioner John Hamm and Attorney General Steve Marshall in Miller’s lawsuit, said it was “very likely” that the state could carry out an execution by nitrogen hypoxia by Sept. 22.

“The protocol is there, but I won’t say it’s final,” Houts said at the federal court hearing.

Miller’s attorneys have argued that the state is depriving Miller of equal protection under the law, comparing his case to that of Jarrod Taylor, whose execution by lethal injection was called off after he alleged that Alabama officials lost his nitrogen hypoxia election form. Taylor waived his attorney-client privilege and provided copies of the signed form and email communications to the court in 2021. Miller’s attorneys have not provided similar privileged documentation.