Susanne MacGregor1, Nicola Singleton2, Franz Trautmann3. 1. Centre for History in Public Health, London School of Hygiene and Tropical Medicine, University of London, 15-17 Tavistock Place, London WC1H 9SH, United Kingdom. Electronic address: Susanne.MacGregor@lshtm.ac.uk. 2. Independent researcher - formerly UK Drug Policy Commission. 3. Trimbos Institute Utrecht.