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In a U.S. government warning high on the creepiness scale, the Defense Department cautioned its American contractors over what it described as a new espionage threat: Canadian coins with tiny radio frequency transmitters hidden inside.
The government said the mysterious coins were found planted on U.S. contractors with classified security clearances on at least three separate occasions between October 2005 and January 2006 as the contractors traveled through Canada.
Experts said hiding tracking technology inside coins is fraught with risks because the spy's target might inadvertently give away the coin or spend it buying coffee or a newspaper.