The Department of Homeland Security’s Science and Technology Directorate in collaboration with the Combating Terrorism Technical Support Office of the Technical Support Working Group has issued a Request for Information (RFI) regarding standoff optical techniques for the detection of trace quantities of explosives on vehicles. The agencies are seeking technologies ranging from Technology Readiness Levels 2 through 9. A successfully deployed non-contact system will detect sub-microgram amounts of explosives spread across defined surface area at ranges greater than 20 meters within seconds will incurring a very low false alarm rate and performing in a variety of weather conditions. Respond by June 12. Contact: Barry Smith, Transportation Security Laboratory, 609-813-2844, [email protected].