However, medical and legal experts told ABC News that nitrogen gas as a method for execution is untested and there’s no evidence the method will be any more humane or painless than lethal injection.
“I’ve never heard anyone say, ‘We’ve got this new method of execution. We’ve looked at it carefully. We know that this method of execution will cause a death that will not be cruel. Here’s the evidence,’” Dr. Joel Zivot, an associate professor in the department of anesthesiology at Emory University School of Medicine, told ABC News. “That’s what needed to be said. No one has said that.”
The same technique is being studied for assisted suicides where the terminal patient gets to administer or even withdraw it themselves. That is likely to have a better ethical standing since it’s about dying with dignity if they can’t live with dignity. It’s likely to confirm if nitrogen asphyxiation is as painless as they claim.
That aside, some meds say that hypoxia is painless as long as carbon dioxide content in the blood remains low. Even carbon monoxide poisoning victims seem to die in sleep. That sounds way better than any of the other methods of execution. Not that I support the death penalty.