It's the Law
California law pertaining to Wine Grapes and Wine and By-products can be found in the California Food and Agricultural Code, Chaper 3, and in the California Code of Regulations, Article 1, Subchapter 1, Chapter 3 (law).
Official Wine Grape Inspection Certificates will include the statement: I certify the above lot or load of grapes have inspected and tested as specified in Division 16, Chapter 1, Section 40531 and Chapter 3, Sections 41162 and 41191 and 41192 of the Food and Agriculture Code.
Certificates can also be issued in the form of a combination weight tag, or results may also be printed on a computer-generated form.