How much marijuana is really in that pot brownie? Chocolate can throw off potency tests so labels aren’t always accurate, and now scientists are trying to figure out why.In states where marijuana is legal, pot comes in cookies, mints, gummies, protein bars – even pretzels. These commercial products are labeled with the amount of high-inducing THC. That helps medical marijuana patients get the desired dose and other consumers attune their buzz.Story continues belowRelated