If your cat uses the bathroom outside, spy on them, then dig up their stool.

I have a cat, but I often times have questions about them like, "Are cats natural manicurists?" "Who taste-tests cat food?" and "Who do you call if a cat gets stuck in a tree?" Well, thanks to the magic of the interweb, and some re-editing of an old VHS called From Cats to Kittens, I now know the answers these questions and more. I also know that the host is very odd, and the fashion of the 1980s was awesome (apparently cocaine is a hell of a drug).