Threshold quantities (TQs) for drug law and policy are being experimented with across many jurisdictions. States seem attracted to their apparent simplicity and use them to determine, for example, whether: a possession or supply offence is made out (e.g. Greece); a matter should be diverted away from the criminal justice system (e.g. Portugal); or a case should fall within a certain sentencing range (e.g. UK).
Distinguishing between drug possession for personal use and supply and trafficking is widely acknowledged as one of the most difficult and controversial issues facing drug legislators and policy makers. To address the problem, two solutions are typically enacted: the threshold scheme and the "flexible" model.