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Deputy Brock Bonds, Caddo Parish Sheriff Office, and K-9 Samos inspect a flatbed trailer for narcotics and explosives during a training exercise at Barksdale Air Force Base, Louisiana, Jan. 25, 2022. Police dogs are trained to recognize numerous controlled substances, making them a valuable asset to law enforcement agencies. (U.S. Air Force photo by Airman 1st Class Nia Jacobs)