31 Pa. Stat. § 700j-401
Except as herein otherwise specifically provided, a milk dealer or handler, as defined in this act, shall not buy or handle milk, whether as a broker, factor, bailee, consignee, or otherwise, and whether or not by contract or operation of law title passes to the handler, from producers or others within this Commonwealth for storage, consignment, brokerage, manufacture, processing, distribution, or sale within or without this Commonwealth, or manufacture, process, handle, sell or distribute milk within this Commonwealth, unless such dealer or handler be duly licensed as herein provided; and it shall be unlawful for a milk dealer or handler to buy or receive milk from, or sell or consign milk to, or handle as broker, factor, consignee or otherwise, milk for, a milk dealer or handler who is not either licensed or exempted as herein provided, or, in any way, to deal in or handle milk which he has reason to believe has previously been dealt in or handled in violation of the provisions of this act.
31 P.S. § 700j-401