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But there's enough information in the open literature to get a sense of what the government is pursuing: laser-based reflectors, super-strength RFID tags, and homing beacons so tiny, they can be woven into fabric or into paper.
Some of the gadgets are already commercially available; if you're carrying around a phone or some other mobile gadget, you can be tracked--either through the GPS chip embedded in the gizmo, or by triangulating the cell signal.
Privacy and civil liberties advocates have long been opposed to the use of RFID technology on consumer items and government documents because it can be used to track people without their knowledge or consent. But now security researchers are warning RFID systems are vulnerable to viruses that could wreak havoc on databases around the world and potentially facilitate a terrorist attack.