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After training three or four bees are put in a shoebox-sized "sniffer box", held in position on plastic mountings. Air is sucked by a fan into the box via plastic tubes and wafts gently over the bees. If they detect explosives in the air, the trained bees all stick out their proboscises together.A miniature video camera in the box is trained on them and is connected to a computer programmed with movement recognition software. As soon as the movement of the proboscises is detected, an alarm sounds to alert the security operator.