Cal. Health & Safety Code § 110380

All regulations and their amendments pertaining to foods, drugs, devices, and cosmetics that are in effect on the effective date of this part, or that are adopted on or after that date, pursuant to the Fair Packaging and Labeling Act (80 Stat. 1296; 15 U.S.C. Sec. 1451 et seq.) shall be the regulations of this state. The department may, when necessary, prescribe any packaging and labeling regulation for foods, drugs, devices, and cosmetics whether or not the regulation is in accordance with regulations adopted under the Fair Packaging and Labeling Act. No regulations shall be adopted that are contrary to the labeling requirements for the net quantity of contents required pursuant to Section 4 of the Federal Fair Packaging and Labeling Act and the regulations adopted pursuant to that section.