Oklahoma constitution
Article VII-a: court on the judiciary
Section 3

(c) In the exercise of its jurisdiction, the Court is vested with full judicial power and authority, including the power to summon witnesses to appear and testify under oath and to compel the production of books, papers, documents, records and other evidential objects; to issue all manner of judicial and remedial process and writs, legal or equitable; to provide for discovery procedures in advance of trial; to make rules governing procedure; to grant full immunity from prosecution or punishment when deemed necessary and proper in order to compel the giving of testimony under oath or the production of books, papers, documents, records or other evidential objects. The specific enumeration of powers herein shall not derogate from the existence of other judicial power and authority in the Court, or from the exercise thereof in aid of its jurisdiction.