Okla. Stat. tit. 74, § 78a

A. State agencies with authority to own motor vehicles shall submit a requisition to the Director of the Office of Management and Enterprise Services prior to acquisition of a motor vehicle. The requisition shall state the type of vehicle, the intended purpose of the vehicle, a statement that the agency has actual need for the vehicle, the supplier of the vehicle, that the state agency has sufficient funds to acquire and maintain the vehicle and cite the statutory authority of the state agency to acquire a vehicle. B. The Director of the Office of Management and Enterprise Services shall review the requisition and approve or deny the request of the state agency within fifteen (15) days of receipt. C. The provisions of subsections A and B of this section shall not apply to the Department of Public Safety, the Commissioners of the Land Office, the Oklahoma State Bureau of Narcotics and Dangerous Drugs Control or the Oklahoma Military Department.