They say money talks, and a new report suggests Canadian currency is indeed chatting, at least electronically, on behalf of shadowy spies. Coins containing tiny transmitters have mysteriously turned up in the pockets of at least three American contractors who visited Canada, says a branch of the U.S. Defence Department. Security experts believe the devices could be used to track the movements of defence industry personnel dealing in military technology. According to a report from the U.S. Defence Security Service, On at least three separate occasions between October 2005 and January 2006, cleared defense contractors' employees travelling through Canada have discovered radio frequency transmitters embedded in Canadian coins placed on their persons." A service spokeswoman said details of the incidents were classified. The type of transmitter in play and its ultimate purpose remain a mystery. However, tiny tracking tags, known as RFIDs, are commonly placed in everything from clothing to key chains to help retailers track inventory. Each tag contains a miniature antenna that beams a unique identification code to an electronic reader. The information can then be transferred by the reader into a computerized database.

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