Eran Lumbroso (R), Chief Technical Officer of BioExplorers, stands next to Chief Operating Officer Israel Alva as he holds mice during a demonstration of their new detection device at a homeland security conference in Tel Aviv November 12, 2012. The mice are trained to sniff smells they consider hazardous at which point they seek shelter in their cubicle and this sets off a warning in the detector. The makers claim that the device has zero false alarms and an extremely high successful detection rate. Picture taken November 12, 2012. REUTERS/Nir Elias (ISRAEL - Tags: ANIMALS SCIENCE TECHNOLOGY)