It is unlawful for any person to sell, offer, or hold for sale any shellfish not in a container bearing a valid certificate number from a state or a nation whose shellfish certification program conforms to the then current Manual of Recommended Practice for Sanitary Control of the Shellfish Industry, issued by the United States Public Health Service.
Source:
Section 112215, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=112215..