Mont. Code Ann. § 50-30-216

If the department finds that the requirements of 50-30-202 (1)(a) are not adequate for the protection of the public health and safety in view of the special hazard presented by a hazardous substance, the department may by rule establish such reasonable variations or additional labeling requirements as are necessary for the protection of the public health and safety, and a hazardous substance intended or packaged in a form suitable for use by the general public or by children which fails to bear a label in accordance with the rules is a misbranded hazardous substance.