Herbal cannabis and cannabis resin are the most widely-misused illicit substances in the UK. In 2006, the Advisory Council on the Misuse of Drugs (ACMD) reviewed the classification of cannabis. One of the recommendations was that a further study should be carried out to determine the market share of different types of cannabis and their potencies. The Home Office funded the project.
A collection of training materials compiled by STRADA, Scottish Training on Drugs and Alcohol.