Nothing in this part shall apply to the sale of chemicals or poisons for use for nonmedical purposes or for uses as insecticides or biologics or medicine used for the cure, mitigation, or prevention of disease of animals or fowl or for agricultural uses that comply with the requirements of the Federal Food, Drug, and Cosmetic Act, 21 U.S.C. § 301 et seq., and all amendments thereto unless those products are prescription drugs under this part.