Mont. Code Ann. § 7-4-2718

If a county attorney receives a complaint concerning official misconduct as provided in 45-7-401 of a local government public officer and the county attorney does not commence an action pursuant to 45-7-401 (3), the county attorney shall refer the complaint and any relevant evidence for the attorney general's review as provided by 2-15-504 within 90 days of the receipt of the complaint.