I don't understand how this would ever work... what is to stop someone from covering it in aluminum foil so it thinks they never move? I mean I understand the

I don't understand how this would ever work... what is to stop someone from covering it in aluminum foil so it thinks they never move? I mean I understand the idea, tax for road usage... ok but why GPS? There is a mechanism for measuring mileage built right into the vehicle, the odometer. Its already there on all vehicles and I would assume less people would try to defeat it. I don't know if Oregon has an annual inspection but it could easily be read then and reported. It seems like the cost of outfitting all cars with GPS devices would be costly... plus it would never work anyway.