A dispensary for medical marijuana in East Vancouver, BC Canada was busted "over suspicions the business has links to organized crime" as reported by CBC News: "during a subsequent investigation, police said they found the store was also selling pot to minors and those without a valid medical marijuana license."
There are good reasons for drug legalization but the argument that such a move will displace organized crime is misplaced. The repeal of Prohibition did not get the Mafia out of liquor and bars, and drug legalization will not stop the criminal element from selling weed or running dispensaries. Organized crime not only is behind illicit rackets but also gets involved in legitimate industries -- think waste carting or concrete pouring -- through an illegal manner. Indeed, once an illegal sector becomes a legal industry the change in status actually provides organized crime with better cover for its continued involvement.
Further reading that may be of interest: