These are very easy to set, but a mouse can still get the peanut butter off without being caught. Dumb animals my foot. The only mouse I caught was not killed. The trap caught it by the front shoulder, and the mouse managed to drag the trap along with into another room. I am not sure how long it had been in the trap, but it also managed to chew half of the trap away. I don't want mice in my house, but it seemed VERY inhumane to have a mouse stuck in a trap like that. I will not use these again.