Britain places cannabis under its first general-public sales controls

Cannabis first came under controls for Britain’s general public through poison law, not dangerous-drugs law. The measure regulated retail sales and labels; it did not yet create a general prohibition on possession or use.

A pharmaceutical decision

The Pharmaceutical Society announced in August 1924 that it had resolved to add cannabis and its resins to the Poisons Schedule. Its published explanation referred generally to court cases involving hashish and other cannabis preparations. James H. Mills found no fuller evidentiary case behind the decision and notes that senior Home Office officials and a Cambridge pharmacologist had not thought cannabis belonged in the dangerous-drugs law.

Under the procedure then in force, the Privy Council approved additions recommended by the Society. The cannabis order took effect on 3 April 1925.

What a legal sale required

Only a chemist could sell a product containing cannabis. The purchaser had to be known to the seller or accompanied by someone known to the seller. The chemist recorded the customer and transaction in a poisons register.

Packaging also changed. A container had to identify the drug and state its proportion to the other ingredients, while displaying the word “POISON” in red or against a red background. Cannabis medicines and other products did not disappear, but ordinary retail access became conditional and documented.

This framework differed from the Dangerous Drugs Acts. It supervised the seller, purchaser and presentation of a legal product instead of placing cannabis within the criminal controls already applied to opium and cocaine.

Parliament debates corn plasters

The practical controversy concerned products such as corn plasters, some of which included cannabis. MPs questioned whether manufacturers and small shops had received enough time to relabel existing stock. The government declined to postpone the order, saying the Pharmaceutical Society’s resolution had been made the previous August and interested businesses had received adequate notice. Mills found no comparable parliamentary debate over the case for classifying cannabis itself as a poison.

This was Britain’s first general-public cannabis control, following the narrower Army Council order of 1916. It was distinct from the 1928 regulations that confined lawful possession and sale to medical and licensed channels.

The index records the 1925 order as context. It moved no score for the United Kingdom because cannabis remained legally available through chemists and possession and use were not yet generally prohibited.^[1]