The city can prove they put the device on your vehicle, but absent other proof, they can't prove the owner removed it, destroyed it or damaged it if it is missing, much as they can't issue a traffic citation to a vehicle, but only to a person operating a vehicle. Of course, the original infractions remain, but if it were that easy to track down people with infractions, they wouldn't need such gizmos. I haven't had a parking ticket within memory, but if someone with one of these on his car would agree to assume all personal liability, I'd enjoy experimenting on it. It would be nice to know someone with a truck suitable for towing. You could throw a tarp over the windshield and take it to a nice private garage with lots of tools. I still favor a sheet of stainless with one edge thinned down to a few thousandths.