I enjoy dreaming up schemes to thwart thieves as much as the next guy, but
remember that you are liable for any injury that may result from your
theft deterent devices. For example, shutting off a car by remote control
once a thief is underway may result in an accident. You would be liable,
not the thief.

***Disclaimer*** My advice and/or opinions: are frequently wrong and may
be hazardous to health and/or property; are my own, and in no way
represent my employer, friends or family; and may be illegal and/or
immoral in some countries.