Adrian Parsons is an experienced drug expert witness and former police officer with over 25 years’ service in UK policing. A Fellow of the Expert Witness Institute, he has provided expert evidence in serious and complex cases since 2005, including large-scale multi-defendant trials. He specialises in UK domestic illicit drugs markets and delivers nationally recognised training to law enforcement and specialist investigative and regulatory agencies, with a strong emphasis on impartiality, robustness, and courtroom resilience.