“…In similar investigations with other highly toxic chemicals such as cyanides, , ammonium metavanadate, ricin, isopropyl bicyclophosphate, tetramine, , brodifacoum, and sarin, − several potential CAS, including trace impurities, have been identified. Specifically, trace impurities have been demonstrated as potential CAS indicative of a manufacturing facility, synthetic route, purification process, reaction solvent, reaction catalyst, lot, ,,,, and precursor stock …”