Mont. Code Ann. § 40-4-303

Mediation proceedings under this part are subject to the confidentiality and privilege provisions of 26-1-813. Mediation proceedings must be conducted in private unless otherwise agreed to in writing by the parties and the mediator. All records of a mediation proceeding are confidential and may not be used in evidence in an action enumerated in 40-4-301. A mediator and the parties to a mediation under this part are entitled to the confidentiality and privilege provisions of 26-1-813.