Originally Posted by
Khendraja'aro
I call BS on any "pinpoint accuracy" of RFID chips. For one, I'm pretty sure that he didn't quite tell you how tracking baggage works. Hint: If you simply take the baggage of the track, tracking goes bye-bye.
Secondly, the range of passive RFID chips (of which we're talking here) is severely limited. And since an RFID chip has no sensors for velocity or position (that would be called "GPS" or something similar), you'd need pretty strong emitters (to overcome the range problem), and at least three of those in every room to allow for triangulation, because the walls would swallow the return signal again (well, you could up the signal strength again, but at that point you could probably also begin your own radio station with the emitters).
Which means, the "firemen in a house with mere chipcards" scenario is pretty unlikely.
You could see if somewent went through a specially-equipped door while wearing a decent ("not small") RFID tag. Locate the same person inside a room? Not so much. That's what this thing called a "camera" is for (and frankly, does a better job of it).