Research & Education JFS Articles AAFS Connect Conference Proceedings Reference Series Library International Educational Outreach Program Differentiation of South American and Domestic (U.S.) Crack Cocaine Through Headspace-Gas Chromatography/Mass Spectrometry (HS-GC/MS) Presenting section: Criminalistics 2013 Colley, Valerie L., Dulles VA; Casale, John F., Dulles VA View the paper Criminalistics