Retrieved November 19, 2010. ↑ "GAO-19-162 Aviation Security: TSA Uses a Variety of Methods to Secure U.S.-bound Air Cargo, but Could Do More to Assess Their Effectiveness" (PDF). Retrieved July 5, 2019. ↑ "GAO-08-933R TSA's Explosives Detection Canine Program: Status of Increasing Number of Explosives Detection Canine Teams" (PDF). Retrieved November 19, 2010. ↑ Please see Visual Intermodal Prevention and Response article for references ↑ TSA Management Directive No. 1100.73-2 – TSO Dress and Appearance Responsibilities Retrieved May 26, 2010. ↑ Bennett, Brian; Winton, Richard; Gold, Scott (November 1, 2013).