The San Francisco Chronicle reports on the increasing use of RFID tags for a wide range of purposes including tracking preschoolers' whereabouts, authenticating ID badges and retail inventory. While their popularity grows, privacy experts have concerns that the chips could be used to reveal subjects' personal information, including habits and identities. A spokeswoman from the American Civil Liberties Union of Northern California said someone sitting across the street from a preschool could scan children's RFID tag information without ever being detected, for example.
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