Arizona farmers will soon be allowed to grow hemp. The 2018 Farm Bill approved by Congress is opening the door to commercial hemp production. The bill allows hemp to become an agricultural commodity that can go from state to state without restrictions. But anyone who wants to grow the low water use crop will have to be licensed by the state and regulators will collect samples to ensure the hemp has less than point-three percent THC, the active ingredient in marijuana. The rules are being written now. Hemp is used for a number of food, construction, oil, paper and medicine products.