Okla. Stat. tit. 75, § 75-308.2: Rules - Necessity of promulgation - Interpretations not

to change - Prospective effect only - Limitation period on contest

proceedings - Force of law and prima facie evidence.

A. No agency rule is valid or effective against any person or

party, or may be invoked by the agency for any purpose, until it has

been promulgated as required in the Administrative Procedures Act.

B. A proceeding to contest any promulgated rule on the ground

of noncompliance with the procedural requirements of Article I of

the Administrative Procedures Act must be commenced within two (2)

years from the effective date of the promulgated rule.

C. Rules shall be valid and binding on persons they affect, and

shall have the force of law unless amended or revised or unless a

court of competent jurisdiction determines otherwise. Except as

otherwise provided by law, rules shall be prima facie evidence of

the proper interpretation of the matter to which they refer.