Cal. Bus. & Prof. Code § 14431

The use by any person other than the registrant, or owner of the brand and other than the members of the registrant of any container, supplies or equipment, without the written consent provided for in this article, or the possession by any junk dealer, or dealer in secondhand articles, of any containers, supplies or equipment, is presumptive evidence of unlawful use of or traffic in such containers, supplies, or equipment.