Good points Bob, but if not allowed to be grown (agriculture is different than booze and guns that require licensing) the consumer in say California is denied access to legal products that farmers want to grow. No, this is a subject that certainly comes under the FDA, and/or the U.S.D.A. that have Federal Jurisdiction.
Until GMO is positively found to be carcinogenic (bad) by the Feds for humans, farmers must be allowed to grow what they want, as long as the  crop is legal under Federal guidelines.