U.S. Department of Homeland Security reports that 100% scanning is unrealistic with current technologies, * "that the use of the equipment (Non-Intrusive Inspection scanners) would significantly impact trade capacity and the flow of cargo, and that scanning equipment does not adequately provide automatic notification of an anomaly in a container."                  *U.S. GAO report to Congress October 2009  page7   (Read the full report)

The August 2, 2010 edition of "Aviation Week & Space Technology" magazine, a professional aviation industry magazine, asks the all important safety question on it's editorial page; Where's Technology to Screen Cargo?

This editorial questions the TSA & DHS failure "to certify threat detection equipment that would have helped a bedrock industry perform a mandated task efficiently."  page 70 (Read the full editorial)