Amitava Dasgupta, Ph.D, DABCC, FACB, is Professor of Pathology and Laboratory Medicine, University of Texas Health Sciences Center at Houston. He is also the Director of Clinical Chemistry and Toxicology Laboratory of Memorial-Hermann Laboratory Services, the major clinical teaching hospital of the University of Texas. In addition, he is the Medical Director of Memorial-TIRR Hospital laboratory services. He has published over 175 scientific papers, two books on drugs of abuse, one book on herbal medicine, and has edited three professional reference books. He is on the Editorial Board of five major medical journals including American Journal of Clinical Pathology, Archives of Pathology and Laboratory Medicine, Therapeutic Drug Monitoring, and others. He lectures both nationally and internationally on drug and alcohol testing and acts as an expert witness for the State of Texas for alcohol and drug related criminal prosecutions.