When they detect the target scent they stick out their proboscis – similar to a tongue – and the tiny movement is picked up by sensors attached to a computer.
Experts say each bee can be trained within minutes. The project was originated by UK firm Inscentinel – which has just three employees – and a part-time beekeeper in Hertfordshire.
SNIFFER BEES Insects are trained to detect bombs or dope – Mirror.co.uk via digg

対テロ戦略の一つとしてミツバチの利用研究が進んでいるというのだが (素子がBeeを操っている画像を載せたかったんだが見つからなかったよう(´Д`;))