Would each individual person affect the RFID tag's radio signal in a unique way?

ENGADGET: Putting your finger on it

If a sensor detects a problem, the RFID tag transmits this to the control unit which can emit an (audible) alarm or shut off the water supply.

ENGADGET: RFID is in the toilet

The new RFID tag-toting documents will store all of your personal data, including name, address, nationality, a picture, a digitized fingerprint and just about every other thing crooks would need to take your identity for a joyride.

ENGADGET: RFID Passports coming to the US in August

Starting October 2006 the US will issue all new passports using the same ISO 14443 RFID tag and Basic Access Control encryption scheme employed by the Dutch e-passports (and others) and adopted by the ICAO as global standards.

ENGADGET: Dutch RFID e-passport cracked -- US next?

Each Scrabble letter tile has its own uniquely identifiable RFID tag embedded within (100 in total), with an RFID circuit board enclosed in each of the players tile racks to ensure that all information is captured and showcased to the online viewers.

ENGADGET: Scrabble board packs RFID technology, broadcasts tournaments online in real-time, costs 20,000 pounds