Petty Officer 1st Class Christopher Hartman, a member of Coast Guard Maritime Safety and Security Team San Francisco 91105, explains the use of gun powder hidden in a suitcase to reporter Mike Mibach on how a K-9 detects explosives in luggage or cargo during a live demonstration at KTVU Fox 2 news station in Oakland, Calif., Oct. 8, 2015. MSST 91105 is a deployable specialized force trained in anti-terrorism/force protection and maritime law enforcement policies and practices. (U.S. Coast Guard photo by Petty Officer 3rd Class Paul Krug)