Montana Title 7. Local Government § 7-4-2712. Prosecutorial duties

(1) institute proceedings before magistrates for the arrest of persons charged with or reasonably suspected of public offenses when the county attorney has information that the offenses have been committed and for that purpose, whenever not otherwise officially engaged, must be present and assist the magistrate in cases of arrest and appear before and give advice to the grand jury whenever cases are presented to them for their consideration;

(2) draw all indictments and informations.