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Sniffer Bees in a container at Inscentinel Ltd, Harpenden, Herts, UK. Honey Bees (Apis mellifera) have an acute sense of smell and can be trained in minutes using a sugar reward system to respond to one of over a hundred scents (e.g., explosives, drugs, tuberculosis, dry rot, and certain cancers.  The bee's natural response is to stick out their tongues, which breaks an optical sensor and registers a positive. Here 6 bees are lodged in cartridges which are then mounted into a portable hand held device called a VASOR.