Letters to the Editor
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RFID might be limited for now
But they are working on it... DHS has an rfp for RFID that among other things, will "sense all tokens carried by travelers seated in a single automobile, truck, or bus at a distance of up to 25 ft while moving at speeds up to 55 mph." And, "For bus traffic, the solution must sense up to 55 tokens." - http://tinyurl.com/5rkmca
Many devices already have RFID chips in them like the tokens you use to pay for your gas, your car door opener, passports, and ID cards etc. These can be used to track you. They will be used to track you.
Recent cell phones have gps built in, this allows your provider and presumably the gubmint to keep track of your movements.
Here is a link to short concept video on how DHS plans on tracking you at airports.
http://www.spychips.com/RFIDairport.html