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DHS is piloting RFID tags for visitors to the US:

The US Department of Homeland Security has decided to trial RFID tags in an effort to make sure only the right sort of people get across US borders.

The controversial US-VISIT scheme for those visiting the US from abroad already fingerprints holidaymakers on their way into the country and is now adding RFID to the mix in order to improve border management, the department said.

The trials will start at a "simulated port" in the spring and will then be extended to Nogales East and Nogales West in Arizona; Alexandria Bay in New York; and Pacific Highway and Peace Arch in Washington by the end of July.

The testing phase will continue until the spring of next year. The exact way RFID will be used with the travellers is not yet known.

RFID chips will be used to track both pedestrians and vehicles entering the US to automatically record when the visitors arrive and leave in the country.
(From silicon.com via Kossackia )

But don't worry! I'm sure this technology will never be used domestically! Say, for internal passports. Or something.

The other thing, though... How does this work, exactly? How do they make sure our guests and their RFIDs stay together? Do they put the RFID on an ankle bracelet? Make the guests wear special beanies with the RFIDs in the propellor? Inject the RFIDs under the skin?