Mont. Code Ann. § 16-11-310
Minors not liable for possession or attempt to purchase
16-11-310 . Minors not liable for possession or attempt to purchase. An individual under 18 years of age assisting in the enforcement of this part is not liable under a civil or criminal law for the possession of or the attempt to purchase a tobacco product, alternative nicotine product, or vapor product for the purposes of enforcing this part.