On June 11, the Supreme Court of Canada struck down a provision in the country's medical marijuana law prohibiting the possession of marijuana extracts. The ruling potentially opened the door to the production of medical marijuana derivatives including tinctures, edibles, pills, and oils — and American investors took note.

Edibles alone make up 45 percent of legal marijuana sales in the US, and there's little reason to think Canada would ultimately be any different. It's just one reason why the Canadian court's decision made Canada an even more attractive destination for American investment in the marijuana industry. Four US states have legalized recreational marijuana, and 24 others permit some form of legal medical marijuana. But all of those states are potentially in conflict with federal law, which classifies marijuana as a Schedule I controlled substance, illegal for both medical and recreational uses. The resulting uncertainty clouds everything from patients' rights to growers' access to credit.

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