Washington has become the first US state to legalise the recreational use of Marijuana.

Those over the age of 21 are now able to possess and use up to 28 grams of the drug in private areas.

Although some US states do allow cannabis use for medicinal purposes, Washington is the first to legalise it for entertainment.

2SER’s Sam Buckingham-Jones spoke with Professor Alison Ritter, Director of the Drug Policy Modelling Program at the National Drug and Alcohol Research Centre.