Cal. Food & Agric. Code § 61385

Any false statement or representation which is knowingly made, by any wholesale customer or consumer, or anyone that is acting on the behalf of either, to any distributor or manufacturer, or any representative of a distributor or manufacturer, that a competitor of the distributor or manufacturer has offered or is offering to sell, or is selling milk, cream, or any dairy product to the wholesale customer or consumer at a lower price than the manufacturer or distributor has offered or is offering to sell, or is selling it is an unlawful practice.