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POPSWorlds Smallest RFID Tag These tiny RFID tags could be worked into any product; combined with RFID readers built into doorways, theft of consumer goods would be practically impossible. It's not clear from the references provided, but even if this chip needs an external antenna, the attached antenna would be a tiny ribbon of wire more narrow than a human hair and only a fraction of an inch long. These devices could also be used to identify and track people. For example, suppose you participated in some sort of protest or other organized activity. If police agencies sprinkled these tags around, every individual could be tracked and later identified at leisure, with powerful enough tag scanners. Remember in the Mission Impossible movie when the female operative put a tracking tag on the shoulder of a computer programmer? The prop they used in the movie was MUCH bigger than this baby.