For nearly a decade, federal courts have turned away Eighth Amendment challenges to nitrogen-gas execution methods on the same legal ground: the prisoner could describe a risk but could not prove it. Anthony Boyd's October 2025 execution in Alabama may have changed that calculation. Witnesses recorded more than 225 "agonized breaths," visible thrashing against the gurney restraints, and a procedure that ran roughly 38 minutes from start to pronouncement. Capital defenders now argue the trial record contains the documented evidence prior cases lacked, and the next test case is already on the calendar.
Jeffrey Lee is scheduled to die by nitrogen hypoxia in Alabama on June 11, 2026. SCOTUSblog has flagged Lee's case as the likely next vehicle for a merits ruling on whether the method violates the Eighth Amendment's ban on cruel and unusual punishment.
The Glossip wall
The controlling precedent is Glossip v. Gross, 576 U.S. 863 (2015). To win an Eighth Amendment challenge to a method of execution, a prisoner must clear two prongs. First, the method must create a "substantial risk of serious harm." Second, the prisoner must identify a known and available alternative method that significantly reduces that risk.
Both prongs are difficult. The first asks the prisoner to predict suffering before any execution under the protocol has occurred. The second asks the prisoner to volunteer the means of their own death. For nitrogen-gas challenges before 2024, there was no operational record: the method had never been used in the United States. Speculation about what would happen behind the mask was the entire case, and federal courts treated it as such.
What the trial record now contains
Kenneth Smith was the first person executed by nitrogen hypoxia in the United States, on January 25, 2024 in Alabama. Alabama has since executed at least six more men by the same method. Louisiana joined the list with Jessie Hoffman on March 18, 2025, the state's first execution in 15 years and the first nitrogen execution outside Alabama.
The witness accounts are no longer projections. Reporters and counsel who observed Boyd's October 23, 2025 execution documented violent thrashing against the restraints, more than 225 "agonized breaths," and a roughly 15-minute period of heaving breaths inside the full-face mask. The procedure ran from 5:55 p.m. to a 6:33 p.m. pronouncement. The Equal Justice Initiative describes the protocol as still operating on an experimental basis. Louisiana officials acknowledged "convulsive activity" during Hoffman's roughly 19-minute execution, according to DPIC's reporting on the Louisiana protocol rollout.
The pending vehicle: Jeffrey Lee
Lee's federal civil-rights action is the procedural posture defenders prefer for a merits ruling. The Supreme Court denied a stay in Boyd v. Hamm, No. 25A457 on October 23, 2025, the same day as the execution. Earlier nitrogen petitions traveled under docket numbers 23A688 (Smith) and 24A893 (Hoffman), each ending in denial. SCOTUSblog reports that capital defenders see Lee's filings as positioned to push the issue back onto the emergency docket with a fuller evidentiary record than the prior cases carried.
The comparator fight: firing squad, not pentobarbital
The second Glossip prong has historically defeated nitrogen challenges because the prisoner must name a "known and available" alternative. According to the public filings, Boyd proposed firing squad as the alternative method, not pentobarbital. That choice matters. Pentobarbital's availability is contested, and Alabama has not used it since pivoting to nitrogen. Pressing pentobarbital as the comparator invites the state to argue the drug is not "available" within the meaning of Glossip, which collapses the second prong before the first is even reached. Naming firing squad sidesteps that availability argument and keeps the inquiry on the comparative-risk question Glossip actually asks.
The dissents stacking up
The denial in Boyd drew a dissent from Justice Sotomayor, joined by Justices Kagan and Jackson. The written dissent describes "excruciating suffocation" and "psychological terror" as features rather than malfunctions of the protocol, and asserts that prisoners remain conscious for "up to seven full min[utes]" during nitrogen suffocation. That factual finding, drawn from the existing execution records, is what defenders intend to use in Lee's filings to satisfy the substantial-risk prong with documented evidence rather than projection. The dissent pattern across Smith, Hoffman, and Boyd reads to many capital litigators as a roadmap for granting certiorari rather than a string of one-off objections. SCOTUSblog's term-in-review traced the same trajectory across the 2025 emergency docket.
Spillover risk for other states
Mississippi authorizes nitrogen hypoxia under Miss. Code Ann. § 99-19-51, and Oklahoma authorizes it under Okla. Stat. tit. 22 § 1014. Per the Death Penalty Information Center's protocol tracker, only Alabama and Louisiana had operational protocols as of late 2025; Mississippi and Oklahoma had not published implementation procedures. Louisiana's protocol summary mirrors Alabama's mechanics: a full-face industrial respirator mask, pure nitrogen replacing oxygen, gas administered for a "sufficient time period."
Supply-chain pressure complicates any new rollout. The three largest U.S. industrial nitrogen suppliers have publicly prohibited use of their product in executions. A ruling against the Alabama protocol would not by itself strike the statutes in Mississippi and Oklahoma, but it would force every authorizing state to draft procedures that survive Glossip on the record now developed in Alabama and Louisiana.
What capital defenders are betting on
The realistic ask is narrow. Defenders are not seeking a ruling that all nitrogen executions are unconstitutional. They are pressing a fact-bound, as-applied holding that the Alabama mask-and-gurney protocol fails Glossip on the now-documented record. Such a ruling would leave statutory authorizations intact while making them practically unworkable, since every state would need a protocol that does not produce the witnessed reactions documented across the Alabama executions and in Louisiana's Hoffman case. Reporting across the Alabama series documents the pattern witness counsel will offer as proof.
Outlook through summer 2026
The procedural calendar is short. Lee's June 11, 2026 date sets the outside boundary for emergency-docket litigation. The realistic universe of outcomes includes denial accompanied by another fiery dissent, a grant-vacate-remand for further factfinding, or a merits grant taking the question into the Court's regular argument schedule. Each of the prior nitrogen cases ended at the first option. The argument from Boyd's record is that the Court is no longer ruling on what nitrogen hypoxia might do; it is ruling on what nitrogen hypoxia has done.
If you or a loved one is facing a capital case
Capital litigation, including method-of-execution challenges, requires specialized counsel from the trial level forward. Federal habeas timelines are unforgiving and procedural defaults are common. Anyone facing a charge that carries the death penalty should retain experienced capital defense counsel as early as possible.
Related reading
Sources
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SCOTUSblog: Will the Supreme Court end nitrogen gas executions?
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Boyd v. Hamm, No. 25A457, Sotomayor dissent from denial of stay (Oct. 23, 2025)
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DPIC: Alabama execution witnesses report violent thrashing and 225+ agonized breaths
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Equal Justice Initiative: Prolonged execution in Alabama raises alarms
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Prison Legal News: Dissenter excoriates SCOTUS for denying certiorari
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Louisiana Governor's Office: Brief Summary of Nitrogen Hypoxia Execution Protocol
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Bolts: 'Agony' and 'Suffering' as Alabama Experiments with Nitrogen Executions
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DPIC: Three largest nitrogen gas manufacturers prohibit products from use in executions
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