Oregon Revised Statutes Procedure in Criminal Matters Generally § 136.602

(1) Except as otherwise specifically provided by law, the per diem fees and mileage and any expenses allowed under ORS 136.603 due to any witness in a grand jury proceeding, or any prosecution witness in a criminal action or proceeding in a circuit or justice court or before a committing magistrate shall be paid by the county in which the grand jury proceeding or criminal action or proceeding is held. Payment shall be made upon a claim verified by the witness, showing the number of days attended and the number of miles traveled, and a certified statement, prepared by the district attorney, justice of the peace or committing magistrate, showing the amounts due the witness.

(2) The per diem fees and mileage due to any defense witness in a criminal action or proceeding in a circuit or justice court, or before a committing magistrate, and any expenses allowed the witness under ORS 136.603, shall be paid by the defendant. In the case of a defendant determined to be financially eligible for appointed counsel at state expense, these amounts may be paid pursuant to ORS 135.055.