Effective July 1, 1985, no members of Oklahoma boards and commissions shall receive per diem payments or reimbursements for expenses other than those specifically authorized by Sections 500.1 through 500.54 of Title 74 of the Oklahoma Statutes or Section 1501-605 of Title 82 of the Oklahoma Statutes or except as otherwise provided by law. Provided that this section is not intended to prohibit the payment of statutory salaries to members of the Oklahoma Tax Commission, the Oklahoma Transportation Commission and the Oklahoma Pardon and Parole Board.
Okla. Stat. tit. 74, § 500.36