(1) Subpoenas shall be issued and enforced, and witness fees paid, as provided in RCW 34.05.446 and 5.56.010.

(2) Every subpoena shall identify the party causing issuance of the subpoena and shall state the name of the agency and the title of the proceeding and shall command the person to whom it is directed to attend and give testimony or produce designated books, documents, or things under their control.

(a) A subpoena to a person to provide testimony at a hearing shall specify the time and place set for hearing.

(b) A subpoena duces tecum requesting a person to produce designated books, documents, or things under their control shall specify a time and place for producing the books, documents, or things. That time and place may be the time and place set for hearing, or another reasonably convenient time and place in advance of the hearing.

(3) A subpoena may be served by any suitable person over 18 years of age, by exhibiting and reading it to the witness, or by giving them a copy thereof, or by leaving such copy at the place of their abode. When service is made by any other person than an officer authorized to serve process, proof of service shall be made by affidavit or declaration under penalty of perjury.

(4) The presiding officer, upon motion made promptly and in any event at 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.