Okla. Stat. tit. 17, § 17-18: Expert witnesses - Documentation of justification

The Corporation Commission is authorized to employ expert

witnesses to prepare and present testimony in matters pending before

the Commission or in matters concerning the Commission pending in

other state or federal forums. The selection and compensation of

expert witnesses by the Corporation Commission shall be exempt from

the Oklahoma Central Purchasing Act. For expert witnesses selected

pursuant to this section, the Commission shall document, in writing,

the justification for choosing the person selected. The

justification shall include the number of expert witnesses

considered and the cost to the state. Such documentation shall be

available for public inspection and maintained for a period of not

less than five (5) years.