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"Basically, you've given everybody a little radio-frequency doodad that silently declares 'Hey, I'm a foreigner,'" says author and futurist Bruce Sterling, who lectures on the future of RFID technology. "If nobody bothers to listen, great. If people figure out they can listen to passport IDs, there will be a lot of strange and inventive ways to exploit that for criminal purposes." RFID chips are used in security passes many companies issue to employees. They don't have to be touched to a reader-machine, only waved near it. Following initial objections by security and privacy experts, the State Department added several security precautions.