If peanut butter isn't working in the humane trap, it's probably the trap. Try it in the old-fashioned snap-trap. Yes, it's death...but in most cases, it's a quick, clean death (at least for him...it can be a bit nasty for you). That's next best, honestly. Those glue traps are just
evil. In fact, I thought I read they were about to be outlawed...and in the UK, not the US. That's death via several days of terror and starvation. Mice may be vermin, but they're clever little boogers and fully able to appreciate the experience.
Bob, you old heathen, those little verminy brown mice were often kept as pets, and sometimes still are. Here are
instructions on taming wild mice from the early 19th C, though plenty of modern sources can be found via Google. Fancy rats and mice are just a few generations bred up from that. The practice of breeding and exhibiting show rats (yes, really) was started by Queen Victoria's ratcatcher, and rat and mouse breeding has been a popular hobby ever since. Among geeks, I mean. It's been years, so I think my other half may have forgiven me dragging him to a rat show at the
London and Southern Counties Mouse and Rat Club. (No, I was not an exhibit).
That said, mice in the house simply have to go. They're destructive and unhealthy houseguests. We haven't had luck with the humane traps (though I want to try again when I'm there in residence), so I allow Himself to use the snap traps. It's a far nicer death than mice can expect in the wild.
We used poison against rats when I was a kid, but the results weren't always satisfactory.