Nitrogen Asphyxiation - breathing mask at 1.1 atmospheres of 99% nitrogen gas. Wait till the brainwaves have been flat for 5 min before removing.
No toxic chemicals, no pain for the condemned, no blood or other tissues. And most importantly, works on everyone and no “pain and suffering” lawyers.
Nitrogen Asphyxiation - breathing mask at 1.1 atmospheres of 99% nitrogen gas. Wait till the brainwaves have been flat for 5 min before removing.
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Nitrogen Oxide. Very common method of suicide by Dentists; often found in their offices with the masks on. Painless.
My BIL was a dentist. Sometimes, while he was doing stuff to my teeth, I could tell I was about to pass out. I was still concious enough to reach the valve on the mask and let in more air.