California Code, Business and Professions Code - BPC § 12024.5

It is unlawful for any person to sell or advertise for sale any dressed poultry or any other fowl or rabbit in dressed form, either cooked or uncooked, or smoked, fresh, frozen, cooked, dried, or pickled meats or fish other than by weight determined at the time of sale on a scale properly sealed in accordance with this division. Any commodity specified in this section, however, need not be weighed at the time of sale if at that time it is packed in a package or container upon which appears the net weight of the commodity therein. Except as provided below, any person, including, but not limited to, a manufacturer, processor, packer, wholesaler, or jobber that packs any commodity specified in this section in any package which is intended for retail sale, shall mark the net weight of the commodity therein upon the package. Packages of these products intended for retail sale need not be marked by the packer with the net weight of the commodity if they are to be marked with the net weight of the commodity by the retailer who purchases or receives the packages from the packer. This section does not apply to any of the following ready-to-eat food items: