Our local police department had a guy get his squad car stolen TWICE during traffic stops, and they installed an ignition interlock switch on their entire flee to prevent it happening again. Also they relegated the guy to motorcycle duty after that.

Another story is once my friend called me for help because his car would't start. I looked it over; tested his battery etc, but it wouldn't turn over. I asked him if he had an interlock of any sort and he said no. I didnt do any more investigating since the car was still new, so I showed him how to push start it and drove it over to the dealer. Come Monday morning the dealer called him to ask where he had put the interlock loop that he had pulled out from under the dash. "Oh that thing? Yeah I thought that was weird." SMH