(1) Investigative. The commission may subpoena witnesses, compel their attendance, administer oaths, take testimony of a person under oath, or require production for examination of any books, accounts, records, certificates, or papers relating to any matter under investigation or in question before the commission. Subpoenas may be issued by any member of the commission.

(2) Adjudicative. Subpoenas shall be issued and enforced as provided by chapter 10-08 WAC, chapter 34.05 RCW, and chapter 42.52 RCW, as appropriate.