Arizona dispensaries are required to test cannabis products for potency and contaminants. Testing regulations, implemented in 2020, cover potency and contamination from microbials, heavy metals and ...

California’s cannabis has long been known for being notoriously strong, but test results from the state’s legal stores show that weed in the Golden State is getting weaker. Experts say there’s more to ...

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 ...