Interesting in theory, terrifying in practice. That makes everyone (or will eventually lead to everybody being) trackable, all the time. The only way to avoid it would be to leave any remotely electronically active area (and even then you'd be found upon re-entry) or having 2 people get close enough to confuse the hell out of the system.
Actually, combine it with the increasingly sophisticated electronics we all carry on our person, and you probably end up with a near perfect system for finding out where absolutely everyone is at all times. Identification would be tricky at first, mind.
Actually, combine it with the increasingly sophisticated electronics we all carry on our person, and you probably end up with a near perfect system for finding out where absolutely everyone is at all times. Identification would be tricky at first, mind.