See, those people who claim that the paper money in their wallet has homing devices in it, that they have implants in their molars, and black UN helicopters are following them around are… okay, they’re completely insane, but they may have given some spy op a great idea. According to this AP story, Canadian coins were discovered on several US contractors, with high security clearances, that had tiny radio transmitters in them. US Defense Security, which issued the warning, is being tight-lipped about many further details (they just wanted to warn contractors and others to suspect their pocket change and check their piggy banks), but outside experts were quick to bring up China, Russia and France, at least as having operations sophisticated enough to create such devices. Sophisticated enough? Hell, I could almost do this with a few kits and parts from SparkFun.