California Code, Business and Professions Code - BPC § 12609

The secretary shall adopt necessary regulations to carry out the purpose of this division and for the testing of packages to verify the net quantity statements.  In adopting these regulations, the secretary shall adopt by reference the packaging and labeling requirements recommended by the National Council on Weights and Measures and published in the current edition of the National Institute of Standards and Technology Handbook 130, Uniform Packaging and Labeling Regulations, except insofar as those requirements are specifically modified, amended, or rejected by regulation by the secretary.  The regulations shall include exemptions from full compliance with this chapter for good and sufficient reasons.  Any exemptions affecting consumer commodities shall be in conformance with exemptions permitted by federal regulations.  Any regulation, or amendment thereof, shall be adopted by the secretary in conformity with Chapter 3.5 (commencing with Section 11340) of Part 1 of Division 3 of Title 2 of the Government Code.