Sgt. Mark McMurray slides his hands quickly across the cars in the parking lot, instructing his partner, Brandy, a Labrador mix, to sniff “high” or “low” for possible explosives. Inhaling voraciously, Brandy follows McMurray’s orders. Suddenly, she stops and sits down—her signal that she has found a bomb. But no bomb squad was called in on this day. Mark McMurray and Brandy were one of the 94 regional championship teams from police departments, the Central Intelligence Agency, airports, and military facilities competing at the sixth annual National Detector Dog Trials, last April in Huntsville, Alabama. The “bomb” Brandy found was actually a nonworking explosive.