Mont. Code Ann. § 61-3-704

Any person operating a motor vehicle, trailer, semitrailer, or pole trailer in violation of the intent and purpose of 61-3-701 or 61-3-702 is guilty of a misdemeanor and upon conviction shall be punished by a fine of not less than $10 or more than $50, confined in the county jail for not more than 30 days, or both.