In 2014 marijuana was legalised for recreational use in Colorado and Washington states in the US. Oregon, Alaska, California, Nevada and Massachusetts have all followed. These votes were the result of fierce campaigns. Activists argued that changing the law would eliminate the black market in marijuana; creating a legitimate, taxable industry and allowing the police to focus on more serious crime. Opponents feared more people would become cannabis addicts and predicted an uptick in health problems and robberies. So – three years in – what happened?

Presenter: Ruth Alexander

(Photo: Jars full of medical marijuana are seen at Sunset Junction medical marijuana dispensary in Los Angeles, California. Credit: Getty Images)