You realize your car's been stolen and you tell the cops your license plate number. Now, with that info, they use a special reserved frequency to send a code to the transmitter of every similar car and, if it is the car, it'll respond. For example, if it's a blue 98 Nissan Sentra, then, everytime a cop sees one a blue Sentra, he'll use his transmitter to try and talk to the one in the car. The code needs to be really long and the transmitter should be illegal to possess - only the cops are allowed to have it. Also, such transmitters can be installed in toll plazas. Everytime a car passes through one, RFID can be used to get basic info about the car without need for a special trasceiver of any sort - can be completely reflection based, located on the underside of the car. Also, it should be illegal to remove this reflector.
Now, how do you get around this... within hours of the car being stolen, the bad guys are already dismantling it for parts and trying to sell the parts. Hmm...
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