Commercial hemp is currently experiencing a revival due to its many applications. Commercial hemp varieties contain only small amounts of psychoactive (intoxicating) cannabinoids, which include Δ9-tetrahydrocannabinol (Δ9-THC). A team of researchers led by the German Federal Institute for Risk Assessment (BfR) has now investigated the consequences of feeding hemp silage to dairy cows. Silage is animal feed preserved by fermentation.