tracking passports and collision avoidance ID (Score 1)

I have read that all rfids have a unique serial number called a collision avoidance ID. Its apparantly very low level and little talked about. But its necessary so that a scanner can differentiate between multiple rfid's places next to each other. Think bag of groceries or even a queue of people waiting to get thru customs. So if you have an rfid in your pocket, you can be tracked, period.