ScienceLegal lowTo play this audio please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoScience06/08/2015June 8, 2015Heroin is in decline, but cannabis and "new drugs" pose Europe's biggest drugs challenge. Wolfgang Götz, director of the European Monitoring Centre for Drugs and Drug Addiction on the agencies latest report.https://p.dw.com/p/1FdbiAdvertisement Interview: Zulfikar Abbany