The data in this report were collected as part of the Australian Institute of Criminology’s Drug Use Monitoring in Australia (DUMA) program, which is a quarterly collection of criminal justice and drug use information from police detainees at multiple sites across Australia. From January 2015 to December 2016, 4,400 adult police detainees were interviewed in Brisbane, Adelaide, Perth and Sydney (Bankstown and Surry Hills), most of them male (83%; n=3,647). Recent users of heroin reported using on average 12 days out of the last 30 days before detention and rated the availability at eight out of 10, while quality was given an average rating of six out of 10. Detainees reported that heroin was approximately $50 per point, with recent users reporting that the price had remained the same compared with the three months prior to interview.