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Joe Uchill May 17
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Error in LocationSmart's free trial system let anyone track anyone

Phone cases at an Apple Store
Phone cases, from a Chicago Apple Store, in a photo taken in March. Photo: Jim Young/AFP via Getty Images.

A bug in a service used to track cellphones allowed anyone who signed up for a free demonstration to track any person without consent, ZDNet reports. That service, LocationSmart, is intended for marketers but was used by another firm, Securus, to provide law enforcement with a controversial phone tracking system.

Why it matters: LocationSmart can be used to track nearly all domestic cell phones in the U.S. and Canada.