Staff at the U.S. Transporation Security Administration (TSA) Systems Integration Facility, one playing the role of a airline passenger (L) demonstrate the use of Millimeter Wave technology for passenger security screening in Washington, December 30, 2009. The TSA demonstrated two advanced imaging technologies that are used to safely screen passengers for metallic and non-metallic threats including weapons, explosives and other objects concealed under layers of clothing without physical contact.[Xinhua/Reuters]