16. Gun detection canines
In the past, gun detection canines have been successfully used to deter students and non-students from having firearms in their cars, in student lockers and hidden on campus grounds. In recent years, new training approaches have been developed that make it possible for officers to use canines to detect people in public settings who are carrying a firearm or an explosive device. Particularly helpful for large events such as concerts, athletic events and graduation ceremonies, these impressive canines can detect the scent trail left by a pedestrian as they walk.