The Board, through its Chairperson or Vice Chairperson, may administer oaths and may compel the attendance of witnesses and the production of physical evidence before it from witnesses upon whom process is served anywhere within the state, as in civil cases in the district court, by subpoena issued over the signature of the Chairperson or Vice Chairperson and the seal of the Board. Upon request of the licensee and statement under oath that the testimony or evidence is reasonably necessary to his defense, the Board shall use this subpoena power in behalf of the licensee.
Okla. Admin. Code § 690:5-5-3