I read about this topic a few months ago and now it's in the news!
http://www.aolnews.com/world/article/bees-could-be-put-to-work-as-bomb-detectors/19411285
Once they're seated in the machine -- called a VASOR (for Volatile Analysis by Specific Olfactory Recognition) -- a fan sucks air past the immobilized bugs' antennae. If they detect a trace of Semtex, for example, the bees will extend their tongues in hunger, breaking beams of light that run in front of their heads and sending a signal to the VASOR operator. That automatic warning system means that anyone can use the gadget after a few hours of basic training. In contrast, learning how to handle a sniffer dog can take many months. And as the gadget contains 36 bees, all individually testing the atmosphere, the VASOR offers greater accuracy than a single explosives hound's nose. "It's almost like having a pack of well-behaved sniffer dogs," Briens says.
Ermie
http://www.aolnews.com/world/article/bees-could-be-put-to-work-as-bomb-detectors/19411285
Once they're seated in the machine -- called a VASOR (for Volatile Analysis by Specific Olfactory Recognition) -- a fan sucks air past the immobilized bugs' antennae. If they detect a trace of Semtex, for example, the bees will extend their tongues in hunger, breaking beams of light that run in front of their heads and sending a signal to the VASOR operator. That automatic warning system means that anyone can use the gadget after a few hours of basic training. In contrast, learning how to handle a sniffer dog can take many months. And as the gadget contains 36 bees, all individually testing the atmosphere, the VASOR offers greater accuracy than a single explosives hound's nose. "It's almost like having a pack of well-behaved sniffer dogs," Briens says.
Ermie