Mont. Code Ann. § 33-20-1204

The group life insurance policy and certificate must contain a provision that a copy of the application, if any, of the policyholder must be attached to the policy when issued, that all statements made by the policyholder or by the persons insured must be considered representations and not warranties, and that a statement made by any person insured may not be used in any contest unless a copy of the instrument containing the statement is or has been furnished to the person or to the person's beneficiary.