California Code, Business and Professions Code - BPC § 12211

Each sealer shall, from time to time, weigh or measure packages, containers, or amounts of commodities sold, or in the process of delivery, in order to determine whether they contain the quantity or amount represented and whether they are being sold in accordance with law.

The secretary shall adopt necessary regulations governing the procedures to be followed by sealers in connection with the weighing or measuring of amounts of commodities in individual packages, containers, or lots of packages or containers, including the procedures for sampling a lot, and for determining whether any package, container, or a lot of packages or containers complies with this section.

In adopting those regulations, the secretary shall adopt by reference the package checking procedures recommended by the National Conference on Weights and Measures and published in the current edition of the National Institute of Standards and Technology Handbook 133, “Checking the Net Contents of Packaged Goods,” and any subsequent amendments thereto, except insofar as those requirements are specifically modified, amended, or rejected by a regulation adopted by the secretary.

Any lot, package, or container of any commodity that conforms to this section shall be deemed to be in conformity with this division relating to stated net weights or measures.

Whenever a lot, package, or container of any commodity is found to contain, through the procedures authorized in this section, a less amount than that represented, the sealer shall order, in writing, that lot, package, or container of commodity off sale and require that an accurate statement of quantity be placed on each package or container before it may be released for sale by the sealer in writing. The sealer may seize as evidence any package or container that is found to contain a less amount than that represented.