Petty Officer 2nd Class Elliott Felix, a maritime enforcement specialist and dog handler assigned to Maritime Safety and Security Team 91101 in Seattle, listens as Cheryl Bishop, a special agent and canine handler for the Bureau of Alcohol, Tobacco, Firearms and Explosives, discusses the importance of post-blast investigations during a scenario-based explosives detection training at the University of Washington in Seattle, Nov. 17, 2015. Explosives detection canines can be used after an explosion to detect shrapnel and contaminated sediment, which help investigators determine the explosive type and pin down possible suspects. (U.S. Coast Guard photo by Seaman Sarah Wilson)