Witnesses before the commission, its member, agent, or agency, shall be paid the same fees and mileage that are paid witnesses in the courts of this state. Witnesses whose depositions are taken and the person taking the same shall be entitled to same fees as are paid for like services in the courts of the state.
RCW 49.60.170
Courts of record-Witnesses: Chapter 2.40 RCW.
Discovery and depositions: Title 5 RCW; see also Rules of Court, CR 26 through 37.