If they want to do someone quickly and painlessly a bullet in the back of the head is ideal. It’s messy, but it works.

And as I’ve said before I think the position of executioner should be filled by conscription of a different person for each execution. Anyone that can vote might get a letter telling them that on this day they must be at this prison no later than 9:00 PM to kill this person at midnight.

I suspect a lot of people in favour of the death penalty will suddenly become quite squeamish if they might be the one who got blood and brains all over themselves.