A new group looking at whether to decriminalise cannabis in the UK has been set up by London mayor Sadiq Khan.
Former justice secretary Lord Charlie Falconer QC will chair the first ever London Drugs Commission.
Mr Khan described his visit to a cannabis dispensary in the US state of California as “fascinating”.
But Home Secretary Priti Patel said the mayor of London was wasting his time as he “has no powers to legalise drugs”.
Labour said in a statement the party does not support changing the law on drugs.
Cannabis is currently classed as a class B drug in the UK, with a maximum sentence of five years in prison for possession.