This book elaborates on the topics covered by top experts in the field of drug testing at an international symposium held in March, 1990. The book is an excellent reference for all professionals involved in the set up, performance and interpretation of results for drug testing programs using biological fluids (especially urine). U.S. and European perspectives are presented in relation to workplace testing. Organizational aspects for reliability of drug testing include topics ranging from sample collection, chain of custody, and laboratory strategies to legal and regulatory aspects. Critical reviews of analytical methodology involve descriptions and critical issues for the major presumptive and confirmatory techniques, including immunological and gas chromatographic-mass spectrometric methodologies. The book's interpretation of results takes into account the metabolic, pharmacokinetic, pharmacodynamic and clinical aspects. The final chapters of the book include topics addressing aspects for potential international harmonization.