Idaho Rules of Civil Procedure Rule 45(e)(2). Service of Subpoena.
A subpoena may be served by an officer authorized by law to serve process or by any other person who is not a party and is not less than eighteen (18) years of age. Service of a subpoena upon a person named therein shall be made by delivering a copy thereof to such person and by giving or offering to the person at the same time, if demanded, the fees for one (1) day's attendance and the mileage allowed by law, except that no prepayment tender of fees and mileage shall be necessary to witnesses subpoenaed by the attorney general or any prosecuting attorney on behalf of the state. Service of a subpoena upon a party to a legal action or proceeding can be made by service on the attorney of record for that party in such legal action or proceeding as provided in Rule 5(b) for attendance at a hearing or trial with or without the production of documents or other objects. No prepayment tender of fees and mileage shall be necessary to that party, but the court in its discretion may, upon a hearing held thereon at any time after service on that partyís attorney, determine under all of the circumstances then existing, the reasonable amount of such fees and mileage to be paid, if any, to that party. When the subpoena is issued on behalf of the state or an officer or agency thereof, fees and mileage need not be tendered. When service is by an officer it must be returned with the officer's certificate of service, and when served by any other person it must be returned with an affidavit of such person of its service.