Okla. Stat. tit. 74, § 228

The administrative head and the governing body of any state agency, board, department or commission having internal audit functions shall have direct supervisory responsibility over all internal audits conducted by the agency, board, department or commission. Such supervisory responsibility shall include, but not be limited to, the duty of assuring that all internal audits are conducted in accordance with the "Standards for the Professional Practice of Internal Auditing" developed by the Institute of Internal Auditors or any successor organization thereto.