Try this. No poison, no traps. A small bucket (1-2 gal is big enough, a coat hanger, a pop can and a dab of peanut butter is all you need.
Straighten out the coat hanger and poke a hole in the bottom of the can. Slip the can on the wire lengthwise and lay it across the mouth of the bucket. Put the PB on the can and 3 inches of water in the bucket. Put it near a bench or something the mouse can crawl up on to reach the rim of the bucket. I've used a piece of wood as a ramp, too.
Mouse crawls across teh wire to the can to eat the PB, the can spins and dumps him/her into the water. They drown...keeps working.
Variations I've used...5 gallon bucket and 6 inches of water for rats. Antifreeze for winter in the barn (obviously, restrict access to pets and small kids).
Caught a possum once. He wasn't dead, but he wasn't happy, either. I let him go...and closed the door to the shop.
