This solicitation is a Broad Agency Announcement (BAA) issued under the provisions of paragraph 6.102(d)(2) of the Federal Acquisition Regulation (FAR) to provide for the competitive selection of research proposals. A formal Request for Proposal (RFP) will not be issued. The Department of Homeland Security (DHS) Science & Technology (S&T) Directorate is soliciting white papers which will be evaluated in accordance with this BAA. From the submitted and evaluated white papers, participants may be invited to submit full proposals under this BAA. Contracts based on responses to this BAA are considered to be the result of full and open competition and in full compliance with the provisions of Public Law (PL) 98-369, The Competition in Contracting Act of 1984. Awards under this BAA are planned in Fiscal Year (FY) 2014. Currently no funds are committed for any contract awards that may be selected pursuant to this BAA. No contract awards will be made until appropriated funds are available from which payment for contract purposes can be made. This BAA will consist of four technical areas: Technical Area 1) Retrofit of ETD systems currently approved for air cargo transport screening, specifically those systems listed in the Qualified or Approved Technology sections of the TSAs Air Cargo Screening Technology List (ACSTL) as of January 2014. The retrofit should expand the library while improving detection capabilities and/or instrument reliability and maintainability. Technical Area 2) Delivery of a desktop ETD system for cargo, baggage, and personnel screening in air transport environments that can selectively and sensitively identify threats from a significantly expanded library when compared to trace explosives detectors previously certified by TSA, and is structured to be modular in order to enable spiral upgrades as improvements in explosives detection are realized in the future. Technical Area 3) Development of a portable ETD system that will advance threat detection capability while reducing the required footprint for ETD systems. Technical Area 4) Research and development of various advanced trace explosives detection tools and methods, including signature analysis and data analytics and advanced sampling tools and methodology. All of which will foster spiral upgrades and enhance performance subsequent to the next generation desktop and portable ETD systems.