Security Officer Katrina Wilson looks at a computer screen image made using Millimeter Wave technology that shows a person during a demonstration at the US Transporation Security Administration (TSA) Systems Integration Facility 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. [Agencies]