By BBC. Criminalising cannabis use is a waste of police time, they say, and increases health risks by leaving many people in the dark about what they are taking.
The party is calling for a “regulated market” to control the pricing, potency and packaging of sales to over-18s.
The Conservatives rejected Lib Dem calls to review drug laws in coalition.
The Lib Dems’ attempts to put the issue on the political agenda while in government were rebuffed by Home Secretary Theresa May, who argued existing laws were proving successful in reducing drug use and the harm associated with it.