Most interesting.
Would Bluetooth be slingshot proof? Might a club scramble its electronic innards? How about a dog in heat peeing on it?
The government would need to hire a million Bluetooth guards to watch over the things, don't you think?
Bluetooth is too expensive to be used for tagging everyone. RFID is passive and cheap. But if RFID readers can have their range extended like Bluetooth transcievers, then you would not need very many of them to cover a city, and they could be mounted out of easy reach, like surveillance cameras.