‘Secret shopper’ study finds a lot of Colorado’s weed is weaker than advertised

Nearly half of the labels on cannabis plant products recently tested in Colorado misstated the potency, according to a University of Colorado Boulder study published in the journal Scientific Reports.

Researchers found that THC (tetrahydrocannabinol), the psychoactive chemical in marijuana, was regularly inaccurately labeled on the green bud marijuana tested as part of the study — with most of those products with inaccurate labels having significantly less THC than claimed.