20 years ago I caught 48 in my folks attic. They will often lick the peanut butter off the trap w/out setting it SO, this is what I did. Put a small piece of dog food in the peanut butter so they really have to dig at it and set the trap off. Also, be sure to tie off the trap to something in case they set it off and get 1/2 caught in it and decide to run down your interior wall and die, stinky dude, very stinky if this happens. Those traps will be snapping all night!! Check your local game laws too.