Mont. Code § 50-31-109
Any added poisonous or deleterious substance, any food additive, any pesticide chemical in or on a raw agricultural commodity, or any color additive shall, with respect to any particular use or intended use, be deemed unsafe for the purpose of application of 50-31-202(2) with respect to any food, 50-31-305(1) through (5) with respect to any drug or device, or 50-31-401(1) with respect to any cosmetic unless there is in effect a regulation pursuant to 50-31-108 limiting the quantity of such substance and the use or intended use of such substance conforms to the terms prescribed by such regulation. While such regulation relating to such substance is in effect, a food, drug, or cosmetic shall not by reason of bearing or containing such substance in accordance with the regulation be considered adulterated within the meaning of 50-31-202(1), 50-31-305(1) through (5), or 50-31-401(1).
§ 50-31-109, MCA