Cal. Food & Agric. Code § 64007

“Handler” means any person that, as owner, agent, or broker, purchases, or otherwise acquires from a producer or another handler, possession or control of milk, skim milk, or cream, in the form of unprocessed milk, skim milk, or cream, or in any other unprocessed form, for the purpose of processing it, and includes any person who secures custom processing services on an ongoing basis.