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UNITED STATES - APRIL 5: Ladley, of the Amtrak K-9 explosive detection team, prepares for an explosive detection demonstration at a Senate Commerce Committee markup in Hart Building of the Surface Transportation and Maritime Security Act, April 5, 2017. The legislation would authorize up to 70 additional canine teams to address TSA's protection of surface transportation security that includes rail, transit, highway, maritime and freight transportation. His handler is Off. Dan Scanlon, also appears. (Photo By Tom Williams/CQ Roll Call)

UNITED STATES - APRIL 5: Ladley, of the Amtrak K-9 explosive detection team, prepares for an explosive detection demonstration at a Senate Commerce Committee markup in Hart Building of the Surface Transportation and Maritime Security Act, April 5, 2017. The legislation would authorize up to 70 additional canine teams to address TSA's protection of surface transportation security that includes rail, transit, highway, maritime and freight transportation. His handler is Off. Dan Scanlon, also...
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