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Yahoo NewsThe 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.
Intelligence and technology experts said such transmitters, if they exist, could be used to surreptitiously track the movements of people carrying the spy coins.
http://news.yahoo.com/s/ap/20070111/ap_on_hi_te/spy_coins
I'm sure most of us wouldn't ever have to worry about this, but as the opening paragraph mentions, this is definitely very creepy. Even though coins tend to be lost or spent at random, a well-hidden coin or other object might do the trick.