At times of catastrophe and chaos, scenes of danger where critical evidence is at risk, or high-profile national events from the Super Bowl to inauguration day, a special kind of detective goes to work. Bravery with a bark. >> Good girl.An hour outside Washington DC in rural Virginia, a mission begins at the ATF National K9 Training Center, where months of course work bring together handler and K-9 partner. >> It's a very, very strong bond. Most police officers work 12-hour shifts where they're with their d ...