7 C.F.R. §§ 52.81–52.83

Prior to a plant being approved, or the inauguration of in-plant inspection services, and at such intervals as may be deemed necessary or appropriate, the Administrator will make, or cause to be made, a survey and inspection of the plant where such inspection services are to be performed to determine whether the plant and methods of operation are suitable and adequate for the performance of such service in accordance with:

The plant survey and inspection will be based on the Regulations issued under the Federal Food, Drug, and Cosmetic Act—Human Foods; Good Manufacturing Practice (Sanitation) in Manufacture, Processing, Packing, or Holding (21 CFR part 110)—as may be modified or augmented by the Federal Food and Drug Administration, U.S. Department of Health, Education, and Welfare or the Administrator of the Agricultural Marketing Service.