Acetylfentanyl has been analytically confirmed in 32 fatalities in four European member states between 2013 and August 2015, Germany (2), Poland (1), Sweden (27) and the United Kingdom (2) [REF].
One fatal poisoning caused by intravenous injection of a "bath salt" product containing acetylfentanyl and 4'-Methoxy-α-pyrrolidinoheptiophenone has been reported in 2016 [REF].