Mont. Code Ann. § 27-16-1004
Notice to plaintiff of arrest -- officer's certificate
27-16-1004 . Notice to plaintiff of arrest -- officer's certificate. The officer making the arrest shall immediately give notice of the arrest to the plaintiff or the plaintiff's attorney or agent and endorse on the summons and subscribe a certificate, stating the time of serving the summons and the time of arrest and of the officer giving notice to the plaintiff.