In addition to concerns over reliability, full body scanners have come under significant scrutiny for potential privacy violations. The ProVision "image-free" upgrade, for instance, replaces the 3-D black and white silhouette of the passenger with a "generic, computer-generated outline of a person," according to the TSA.
After the failed December 2009 shoe bombing plot, the TSA worked closely with foreign governments to promote the use of advanced imaging technology (AIT), according to a report by the Government Accountability Office.
L-3 Communications declined to comment for this report. Rapiscan Executive Vice President Peter Kant said the company "clearly disagrees" with the 9/11 Commissions findings on full body scans and said multiple independent and government tests have found the Rapiscan technology more reliable than any other passenger inspection method.
ABC News' Clark Bentson and Troy Mullen contributed to this report.