Meet Our Experts

BACtrack is lucky enough to rely on the wisdom and guidance of a few individuals, each with a lifetime of knowledge in their chosen fields.

Amitava Dasgupta, Ph.D

Amitava Dasgupta received his Ph.D from Stanford University and Fellowship training in Clinical Chemistry and Toxicology from the University of Washington at Seattle. Currently, he is a Professor of Pathology and Laboratory Medicine at University of Texas Medical School 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. His research interest is in the field of drug-drug interaction, alcohol and drugs of abuse testing as well as efficacy and toxicity of herbal supplements using in vitro cellular model or animal model. He has published 182 scientific articles in many medical journals and is a member of the editorial board of five international journals including American Journal of Clinical Pathology, Archives of Pathology and Laboratory Medicine and Therapeutic Drug Monitoring Journal. Amitava is also the author of 12 books, including The Science of Drinking: How Alcohol Affects Your Body and Mind, now available on 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.

William Pelarenos

William Pelarenos is a state certified Standardized Field Sobriety Testing Instructor, a State Certified Breathalyzer Operator and Police Officer for over 26 years with over 900 D.U.I. arrests to date. Officer Pelarenos retired from the Cook County, Illinois Sheriffs Police on Dec 28, 2012. He was one of the “Top Cops” honored by the Alliance Against Intoxicated Motorists (AAIM), Mother’s Against Drunk Driving (MADD), and the Illinois Department of Transportation. The last six years of his career, he was part of a Cook County-wide D.U.I. Enforcement Unit and has testified in hundreds of D.U.I. trials and summary suspension hearings during his career. He is also the author of the book DUIs Decoded, available on and, which is the textbook for seminars he holds for law enforcement and DUI Attorneys across the nation.