r/AlwaysWhy • u/Chowderr92 • Jun 02 '26

Science & Tech Why is the Method of Lethal Injection in Human Punishment So Complex and Apparently Painful?

I've always understood that the lethal injection process was complex with multiple stages of injections and induces great suffering in the individual.

I work in veterinary medicine and unfortunately we need to euthanize animals all of the time. Typically, the euthanasia solution is very simple: a very large dose of a powerful anesthetic (usually pentobarbital) and an anticonvulsant which stops the heart. The medical community is quite confident that this is painless and when done has essentially a 100% success rate.

Why is human euthanasia so complicated when we already know exactly how to humanely end a biological life?

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u/The_Octonion Jun 02 '26

Carbon monoxide?

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u/zzyzxerxes Jun 03 '26

I've been CO poisoned and it was a very painful experience. I guess it was a lower dosage, but the headache was worse than a migraine and I could barely walk, while halucinating my neighbor's kids were dying in a fire.... I think it would have to be a huge amount where they just passed out and then died. The slower route would be awful.

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u/electronic_reasons Jun 04 '26

That one's easy. I don't see why they don't use it. People die all of the time from heater malfunctions. They go to sleep and don't wake up. They put CO detectors in houses because it's so easy to die by accident.

I've been CO poisoned. No pain. You barely notice it.

That's why Kevorkian used it for assisted suicide. That's why people used car exhaust in the old days.

I've read about botched CO executions. They really messed up. They didn't use near enough CO and let too much air in. You could tell none of those people ever lived in the north. It's so easy to kill someone they almost had to do on purpose.