system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do you test a lethal injection?

Lady on a documentary talking about lethal injections just said "the drug is effective, we just completed testing". How does that work?
gpt
These drugs aren't just "kill people" drugs.  They are anesthetics and muscle relaxants.  You know how much it takes to have the effect, as a function of body mass.  You know that if you give a surgical patient too much, you have to revive them.  In a death penalty setting, you give them more than enough, and choose not to revive them.