Mont. Code Ann. § 75-5-636

A person, association, corporation, or agency of the state or federal government may notify the department of an alleged violation of this chapter. Based upon information submitted by the person, association, corporation, or agency, the department shall conduct an investigation to determine the validity of the complaint. If a violation is established by the department's investigation, the department shall initiate an appropriate enforcement response as described in 75-5-617. If the investigation proves the protest to have been without reasonable cause, the department may seek recovery of investigative costs from the person who made the notification.