Okla. Stat. tit. 47 § 2-107
In addition to the salaries or wages of assistants or other employees in the Department of Public Safety when deemed necessary in connection with the discharge of their duties respectively assigned or delegated to them, such assistants or employees shall be allowed and paid traveling expenses incurred in the discharge of their respective duties, in accordance with the provisions of the State Travel Reimbursement Act, Sections 500.1 through 500.19 of Title 74 of the Oklahoma Statutes, which shall be paid from the same fund and in the same manner as the payment of all other salaries and expenses of the Department; provided, however, when deemed necessary by the Commissioner of Public Safety, it shall be and he is hereby authorized and empowered to purchase motor vehicles and other equipment for use by said Department. The Commissioner of Public Safety shall prepare and deliver to the Governor, President Pro Tempore of the Senate, and the Speaker of the House of Representatives a current vehicle fleet management and replacement plan and a complete inventory of all vehicles in use by the Department on the first legislative day of each year. The provisions of this act are to supersede all existing law; provided only that all provisions of this section are subject to provisions of general law governing appropriation, expenditure and availability of funds.
Okla. Stat. tit. 47, § 2-107