Dr Adam Negrusz is an Associate Professor of Forensic Science at the University of Illinois in Chicago, USA. He is the main author of over 50 original peer-reviewed research articles and several book chapters, and was one of the editors of the first edition of Clarke's Analytical Forensic Toxicology. Dr Gail Cooper is the Lead Forensic Toxicologist and Senior Lecturer in the Department of Forensic Medicine and Science at the University of Glasgow in the UK.