CityWatcher.com, a provider of surveillance equipment, attracted little notice itself - until a year ago, when two of its employees had glass-encapsulated microchips with miniature antennas embedded in their forearms.

The "chipping" of two workers with RFIDs - radio frequency identification tags as long as two grains of rice, as thick as a toothpick - was merely a way of restricting access to vaults that held sensitive data and images for police departments, a layer of security beyond key cards and clearance codes, the company said.

At Wired.

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