Mont. Code Ann. § 20-4-303
20-4-303 Abuse of teachers
20-4-303 . Abuse of teachers. Any parent, guardian, or other person who shall insult or abuse a teacher anywhere on the school grounds or school premises shall be deemed guilty of a misdemeanor and, upon conviction of such misdemeanor by a court of competent jurisdiction, shall be fined no less than $25 or more than $500.