Quote Originally Posted by satomi325 View Post
Lethal injection with anesthesia overdose. If a veins cannot be located as they can be difficult to find, they will do direct injection to the heart instead.
This. ^^^ Smaller snakes typically get the injection straight to the heart. But as I said, they can knock them out first if you want. It just costs more. In larger snakes, they use the caudal (tail) vein to euthanize them.