California Code, Public Resources Code - PRC § 42290.5

To encourage waste diversion of polyethylene from California landfills as well as to encourage California's postconsumer market development, it is the intent of the Legislature that any certification of postconsumer materials used for compliance with this chapter not be the same materials that are certified or used for compliance with any other state requirement or with any federal requirement that requires the use or reporting of postconsumer materials for plastic products.