Here's a link I found with more info:

http://unexco.com/mice.html

"Jack" wrote in message
...
You guys have advised how to place the peanut butter in various ways
so that it requires pressure that would trip the spring trap. But he
won't be lured; he'd rather go hungry than take the chance of applying
the needed pressure. He also ignored the electronic trap; must've
gotten a good jolt the other night.

The good news is that he gnawed on a chunk of poisonous block bait.
Very little, but there are definite signs of gnawing in two places.

Mary