@trinsec i can barely fit this one in. it's a really tiny space under the roof, and i had mice who just walked out of the alive traps. also, it often stresses them so much that they get heart attacks.
that's why i wanted a quick and painless method, poison is just evil.
i just need to find and plug the hole where they come inside to prevent this in the first place. it's an old house though, so there are plenty of places to check and miss.