I don't think it's cool having cats roaming around freely btw. Among others, for that reason.
Discussion
To be honest, I think some of the cats spend more time around our house than in their own houses.
We have some nearly-permanent feline squattors who have gotten accidentally trapped in our garage or our basement, when we left the house for weeks. People had to get my MIL to let them out, but we had no idea they were in there.