California Code, Government Code - GOV § 68750

In the conduct of investigations and formal proceedings, the commission or the masters may (a) administer oaths; (b) order and otherwise provide for the inspection of books and records; and (c) issue subpoenas for the attendance of witnesses and the production of papers, books, accounts, documents and testimony relevant to any such investigation or formal proceeding.

The power to administer oaths, to issue subpoenas, or to make orders for or concerning the inspection of books and records may be exercised by a member of the commission or a master, unless the commission shall otherwise determine.