June 2016. On 26 May this year there became a Ban in the UK on the Manufacture and Sale of Substances known as Legal Highs. These are Substances that Mimic the Effect of Illegal Drugs such as Cannabis and Cocaine and till then they were Freely Available. The Ban comes into force amid New Concerns of the Risks Involved. In the days prior to the Ban several People in Rochdale needed Medical Treatment after taking them.