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I'm fairly sure the actual poisonous agent is cyanide in the normal method in the US, but not clear on how they produced it.
I'm vehemently opposed to the death penalty of any kind but I think it's worth pointing out that pro death penalty groups have argued for the use of nitrogen asphyxiation as the ideal execution method. You basically fall asleep with no sensation of struggling for breath or pain before you die. Cheap and considerably less agonising than cyanide. Choosing cyanide is basically torture and execution.
Stonehedge-
Helium is funnier though...
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I think the gas method of execution has come up because the USA is finding it hard to source sodium thiopental used in lethal injections.
This is because the EU won’t sell them it for the purpose of executionhttps://www.google.co.uk/amp/s/www.bbc.com/news/world-europe-16281016.amp
NotThamesWater
Alf0nse
I couldn't tell from that article - when they say last execution by gas ~20 years ago was it the same stuff? I don't really want to know though. Murder-by-state is just horrific by any method.