[zeugma]

Nitrogen gas asphyxiation is the cheapest, most effective quickest, most “humane” way to kill any mammal.

IMO, the only reason it's not universally used in this country is because it is not emotionally satisfying enough.

[P-Marlowe]

Just tie them up and throw them in a lake. If they drown, then you can declare them not guilty and if they survive, you take them to the town square and burn them at the stake.