A simple webcam that runs 19.99 can be made into a security system easily . If the person has access to a computer and the camera can be setup where they need it an hooked to a computer you can catch the rat ba$t*rd ( sorry I hate people like you describe ) in the act for 20 bucks. I have built my own security system this way for less than a 100 bucks I have 3 camera's that record take pictures on motion alert me when there is motion by email and stream across the net so I can check in on the place anytime I want to. I would be happy to detail how to set it up if its feasible for your friend just shoot me a PM