From the website:
They say money talks, and a new report suggests Canadian currency is indeed chatting, at least electronically, on behalf of shadowy spies.
Canadian 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. Department of Defence.
Link - via Boing Boing
Urban legend time. I think they are trying to drum up a little cross-border nonsense.
So you plant a bug in someone's money. It's money - they're going to spend it, duh.
They're not going to take it back home with them. US stores don't take Canadian money.
http://www.foxnews.com/story/0,2933,243018,00.html
The picture clearly shows that they are also doing it to US coins.
Oh, it MUST be true, then...
(insert sarcasm here)