Montana Title 46. Criminal Procedure § 46-15-107. Service of subpoenas

(1) A subpoena may be served by a peace officer or by any other person who is not a party and who is not less than 18 years of age. A peace officer shall serve any subpoena delivered to the peace officer for service in the peace officer's county either on the part of the prosecution or of the defendant.

(2) Service of a subpoena must be made by delivering a copy of the subpoena to the person named and, if ordered by the court, by tendering to those residing outside the county of trial the fee for 1 day's attendance and the mileage allowed by law. The person making the service shall without delay make a written return of the service subscribed by the person, stating the time and place of service.

(3) A subpoena requiring attendance of a witness at a hearing or trial may be served anywhere within the state of Montana.