One massive doseage drip of Pavulon (succhinylcolate?) would suit the job. After twenty minutes of not breathing you can presume the vermin is dead and gone.
We use succ's ( Succinylcholine ) because it doesn't last long but works fast.
FWIW-
85 posted on 04/29/2014 8:11:32 PM PDT by Osage Orange
(I have strong feelings about gun control. If there's a gun around, I want to be controlling it.)