Okla. Stat. tit. 19, § 19-3

Contracts while not acting as a board.

The powers of a county as a body politic and corporate shall be

exercised by its board of county commissioners.

It is hereby declared to be contrary to law, and against public

policy, for any individual county commissioner, or commissioners,

when not acting as a board, to enter into any contract, or to

attempt to enter into any contract, as to any of the following

matters:

(a) Any purchase of equipment, machinery, supplies or materials

of any kind for any county or any commissioner's district, or

districts, thereof;

(b) Any contract or agreement relating to or for the leasing or

rental of any equipment, machinery, supplies or materials for any

county or any commissioner's district, or districts, thereof;

(c) To do or transact any business relating to such county, or

any commissioner's district, or districts thereof, or to make any

contract or agreement of any kind relating to the business of such

county, or any commissioner's district, or districts thereof;

And none of such acts or attempted contracts as above set forth,

done or attempted to be done, by an individual county commissioner

or commissioners, when not acting as a board, shall ever be subject

to ratification by the board of county commissioners, but shall be

illegal, unlawful and wholly void.

Provided that nothing herein shall be construed as prohibiting

or preventing the chairman of the board of county commissioners from

performing such duty or duties as he may be required by law to

perform as chairman of such board, but only after the board, by a

majority vote thereof, shall have authorized and directed such

performance by said chairman.

R.L. 1910, § 1499. Amended by Laws 1955, p. 153, § 1.