California Code, Public Resources Code - PRC § 42292

Each manufacturer shall obtain from its suppliers of recycled plastic postconsumer material for use in the manufacture of plastic trash bags, or other products manufactured with recycled plastic postconsumer material in compliance with this chapter, a statement identifying the quantity, source location, and proximate prior usage of, and the actual postconsumer material content of, each shipment of recycled plastic postconsumer material purchased by the manufacturer, and any other information that the board, may, by regulation, require the manufacturer to obtain from its suppliers, for purposes of inclusion in the annual report required by Section 42293.