Okla. Stat. tit. 10, § 10-132: Tax levy

For the purpose of purchasing sites, erecting or enlarging

buildings, purchasing equipment, repairing or remodeling buildings

or equipment and for the purpose of defraying the maintenance cost

and current running expenses of such schools and homes, the excise

board of each county hereby authorized to establish and conduct such

schools and homes, is hereby authorized in addition to all other

levies, to make an annual levy upon all property in the county

subject to taxation upon an ad valorem basis, of not to exceed one-

half (1/2) of one (1) mill per annum, which is hereby declared not

to be a current expense, and to be for a special purpose, known as

County Supervised School and Home Fund, in addition to the maximum

levy for current expenses now provided by law.