irm.unibe.ch.3Institute of Forensic Medicine, Department of Traffic Sciences, University of Bern, Sulgenauweg 40, 3007, Bern, Switzerland.Abstract

In Switzerland, only cannabis with a total Δ9-tetrahydrocannabinol (THC) content higher than 1% is controlled by the narcotics legislation. Cannabis products rich in cannabidiol (CBD) and low in THC can be legally sold as tobacco substitutes. In this paper, we address analytical and forensic toxicological issues related to the increasing availability and consumption of these products. Based on the analysis of 531 confiscated cannabis samples, we could establish classification thresholds: plant material with a ratio of total THC/total CBD

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