ORS § 18.318
Any salary, wages, credits, or other personal property in the possession or under the control of the state or of any county, city, school district or other political subdivision therein, or any board, institution, commission, or officer of the same, belonging or owed to any person, firm or corporation, shall be subject to execution in the same manner and with the same effect as property in the possession of individuals is subject to execution; however, process in such proceedings may be served only on the board, department, institution, commission, agency, or officer charged with the duty of approving a voucher or claim for such salary, wages, credits, or other property. No clerk or officer of any court shall be required to answer as garnishee as to any moneys or property in the possession of the clerk or officer in the custody of the law.
ORS 18.318