Introduction, I. SunshineTechnical and Legal Aspects of Drugs of Abuse Testing in Hair, M.A. HuestisEnvironmental Exposure - The Stumbling Block of Hair Testing, D.A. Kidwell and D.L. BlankThe Potential for Bias in Hair Testing for Drugs of Abuse, E.J. Cone and R. Joseph, Jr.The Analytical Tools for Hair Testing, M.R. Moeller and H. EserImportance of Supercritical Fluid Extraction (SFE) in Hair Analysis, C. Staub, P. Edder, and J.-L. VeutheyDeterminations of Cocaine and Opioids in Hair, D. Garside and B.A. GoldbergerCannabis and Amphetamine Determination in Human Hair, V. CirimeleUnusual Drugs in Hair, A. TracquiForensic Applications of Hair Analysis, H. SachsHair Analysis for Organic Analytes: Methodology, Reliability Issues, and Field Studies, W.A. Baumgartner and V. HillClinical Applications of Hair Analysis, P. KintzDrug Analyses in Nonhead Hair, P. Mangin