The majority of edibles sold to patients in Seattle, San Francisco, and Los Angeles have inaccurate labels. An analysis of 75 edible marijuana products found that only 17% of the labels accurately described the products' potency. Sixty percent of the products had less THC than their packages claimed, and 23 percent had more THC.

“The point is not to say, ‘Hey, X medical marijuana company, you’re bad,’” says the study's lead author Ryan Vandrey. What's more serious is that “we don’t have the kind of quality assurance for edibles that we have for any other medicine.”

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