The Department of Homeland Security (DHS) Science and Technology (S&T) Directorate has issued a Broad Agency Announcement seeking studies related to chemical attribution signatures for the purpose of recovering and associating samples collected at chemical events with each other and their source (people, places and events). The studies will be done in five technical focus areas: Determine if high-priority chemical threat agents or precursors produced by various synthesis methods or procured from various commercial sources contain/retain chemical attribution signatures that have value in associating various samples with each other and or distinguishing how, where and by whom the recovered threat agent or precursor samples were produced and subsequently handled; determine the environmental factors and effects that can alter chemical attribution signatures and affect recoverability; determine optimal techniques for sampling of different types of chemical attribution signatures at chemical incident scenes to stabilize the samples and minimize derivative chemistry and degradation; determine optimal methods and analytical techniques for conducting comprehensive forensic analyses of samples for source determination and association with other samples; and conduct open source literature sources and provide descriptions of the methods that are being discussed to produce and use various chemical threat agents. Sol. No. BAA_09-16_DHS_ST. Respond by Sept. 18. Contact: Janet Herman, 202-254-6918, [email protected].