Screening for threats includes residue detection. We provide a wide range of analytical chemistry and exposure assessment to detect residues of analgesics, fatty acids, and pesticide metabolites as a potential biomarker of exposure. We perform product chemistry assays, pesticide residue determination, dislodgeable residue, re-entry exposure monitoring, and environmental fate studies. Our scientists have developed specialized analytical methods and testing for energetic residues in water, soil, biota, and other media.