(1) The commission, or presiding officer, may issue subpoenas for discovery, subpoenas to persons to appear and give testimony, and may require the production of any books, papers, correspondence, memorandums, or other records deemed relevant or material and the commission or presiding officer may issue protective orders as a part of an enforcement hearing. The PDC staff or its legal representative may issue subpoenas as may the attorney of the party against whom action is being taken. Upon request of the commission or presiding officer, all subpoenas must be filed with the commission, together with proof of proper service. Such subpoenas will issue and may be enforced in the form and manner set forth in RCW 34.05.446 and WAC 10-08-120(4). The subpoena may be personally delivered or sent by certified mail, return receipt requested.

(2) The commission, or presiding officer, upon motion or before the time specified in the subpoena for compliance therewith, may:

(a) Quash or modify the subpoena if it is unreasonable and oppressive; or

(b) Condition denial of the motion upon the advancement by the person in whose behalf the subpoena is issued of the reasonable cost of producing the books, papers, documents, or tangible things.

(3) The attendance of witnesses and such production of evidence may be required from any place within the state of Washington to any location where a hearing is being conducted.