"Advertising and sales promotion" means, in addition to its ordinarily accepted meaning, trade promotion and activities for the prevention, modification, or removal of trade barriers which restrict the free flow of any commodity to market and may include the presentation of facts to, and negotiations with, state, federal, or foreign governmental agencies on matters which affect the marketing of any commodity that is included in any marketing order or marketing agreement which is made effective pursuant to the provisions of this chapter.
Ca. Food and Agric. Code § 58604