In September 2015, the EMCDDA and Europol examined the available information on a new psychoactive substance N-phenyl-N-[1-(2-phenylethyl)piperidin-4-yl]acetamide (acetylfentanyl), through a joint assessment. The two organisations concluded that sufficient information had been accumulated to merit the production of a Joint Report on acetylfentanyl as stipulated by Article 5.1 of the Council Decision.