This is a good point, and one I hadn't thought of. But I wasn't smelling cat pee often either.
If we had two sets of items, one of which we had some cats pee on, and one of which we had some humans pee on, you think you could sort them into cat/human groups with a high degree of success?
If we had two sets of items, one of which we had some cats pee on, and one of which we had some humans pee on, you think you could sort them into cat/human groups with a high degree of success?