http://www.govtech.net/magazine/channel_story.php/98113
"With a sharp eye focused on the threat of explosives, the Transportation Security Administration (TSA) has deployed explosives detection trace portal machines to Ronald Reagan Washington National Airport (DCA) and Washington Dulles International Airport (IAD). The two airports join Baltimore-Washington International and 23 others nationwide in a program designed to prevent explosives material from getting on-board commercial aircraft."
