POLL: Why do we sterilize the equipment used to administer a poisonous injection?

Answers:
so the injector(?) cannot be charged with murder afterwards, in defence someone spit on the needle or peed in the fluid box.
explanation bacteria can mess with the fatal fluid leading to a long, painful release
Who does that?
this query got old ten weeks ago
so the devil doesnt have to administer penicillin later

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