Jeremy Prichard is an Associate Professor of Criminal Law at the University of Tasmania and an Adjunct Associate Professor at the University of Queensland. His earlier professional roles included appointments at the Australian Institute of Criminology, the Queensland Department of the Premier and Cabinet, and the Queensland Department of Communities, Aboriginal and Torres Strait Islander Partnerships. Wayne Hall is a Professorial Fellow in the Centre for Youth Substance Abuse Research at the University of Queensland. He has Professorial appointments at the London School of Hygiene and Tropical Medicine and the National Drug and Alcohol Research Centre, UNSW. He was: an NHMRC Australia Fellow at the University of Queensland Centre for Clinical Research (2009-2014); Professor of Public Health Policy, School of Population Health, UQ (2005-2009); Director of the Office of Public Policy and Ethics at the Institute for Molecular Bioscience (2001-2005), UQ; and Director of the National Drug and Alcohol Research Centre, UNSW (1994-2001). Jake O’Brien is a Research Fellow at the Queensland Alliance for Environmental Health Sciences (QAEHS). He has a keen interest in wastewater-based epidemiology and his PhD focussed on refining the uncertainties and expansion of wastewater-based epidemiology for assessing population exposure to chemicals (conferred in 2017, UQ). Paul Kirkbride is Strategic Professor of Forensic Science at Flinders University in South Australia. Prior to that academic appointment he was for many years an operational forensic scientist and senior manager at Forensic Science SA, Manager of Business Programs at the National Institute of Forensic Science, and Chief Scientist with the Forensic and Data Centres portfolio of the Australian Federal Police.