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 reported consuming ecstasy on average three out of the last 30 days before detention and rated availability at an average seven out of 10, while quality was rated at an average six out of 10. Detainees reported the price of ecstasy per pill was approximately $15 to $25, with a majority of recent users reporting that the price had stayed the same compared to the three months prior to interview.