The consultant is a recognised authority on the interpretation of drug concentrations in a forensic setting, particularly criminal matters. This expertise focuses on behavioural changes of drugs in assault cases, drug abuse setting and in road crashes attributed to alcohol and drug use. He has provided expert evidence in many hundreds of cases in Australia and elsewhere. He is a member of a number of professional societies including a member of the board of The International Association of Forensic Toxicologists (TIAFT). He has written hundreds of scientific articles, chapters in books and encyclopaedias and has written a book on drug effects.