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David Caldicott is an Irish emergency medicine consultant at the Emergency Department of the Calvary Hospital in Canberra, Australian Capital Territory. He was the convenor of the OzTox Collaboration, an independent multidisciplinary, hospital-based research group committed to a harm minimisation approach to illicit drug use. Caldicott has been an outspoken critic of politicians supporting "zero-tolerance" and prohibitionist drugs policy, questioning the evidence of their efficacy in preventing morbidity and mortality from illicit substances.