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Prof Louisa Degenhardt is deputy director of the National Drug and Alcohol Research Centre in the University of New South Wales, Australia. She spoke to Claudia Hammond about the latest drug policy research and many experts' calls for a public health approach to addiction. A series of reports on the subject has been published by medical journal The Lancet. (Image: Heroin and cocaine. Credit: ÃÛÑ¿´«Ã½.)