I don't think that's how it works. You train your spam filter both with spam and ham and the sets need to have comparable sizes for it to work reliably. So in

I don't think that's how it works. You train your spam filter both with spam and ham and the sets need to have comparable sizes for it to work reliably. So in your example, you'd train it on your patterns of behavior AND patterns of burglars. So unless you had a clear burglarly behavior, the system would probably not flag you out for just behaving differently.