Okla. Stat. tit. 2, § 2-7-406

A. Only Grade A pasteurized milk and milk products or Grade A

raw milk shall be sold to the final consumer; provided, however:

1. Only Grade A pasteurized milk shall be sold through

restaurants, soda fountains, grocery stores, or similar

establishments, including school lunch rooms; and

2. In an emergency, the sale of pasteurized milk and milk

products which have not been graded, or the grade is unknown, may be

authorized by the Commissioner of Agriculture so long as the milk

and milk products shall be labeled "ungraded".

B. Approval by the Commissioner pursuant to rules promulgated

by the State Board of Agriculture for the use of Grade A label on

milk and milk products processed at any milk plant in accordance

with the provisions of the Oklahoma Milk and Milk Products Act shall

constitute an acceptable rating for all intrastate purposes. No

sanitary requirement or standard issued pursuant to the Oklahoma

Milk and Milk Products Act or by any governmental subdivision shall

prohibit the sale of Grade A milk and milk products which are

produced and processed under laws or rules of any governmental unit

which are substantially equivalent to the requirements of the

Oklahoma Milk and Milk Products Act, and which are enforced with

equal effectiveness, as determined by a milk sanitation rating

certified to the U.S. Department of Health and Human Services, Food

and Drug Administration or its successor.