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GPS receivers...well, receive. They don't transmit. So you can't query their location because they don't broadcast anything.
I've heard of systems that are able to detect the repeater in police cars. Supposedly, there is a repeater in the car that picks up the transmission from the officer's radio and rebroadcasts it at higher power. This detector can tell when a police car is in the vicinity but not where it is.
And no, I don't have a link to one. That's how long ago I heard about it. They may use a totally different system now.
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