It shall be unlawful for any person, company or corporation to sell, offer for sale, barter, give away or otherwise dispose of any screening or offal material containing seeds of weeds mentioned in Kan. Stat. Ann. § 2-1314 unless such screenings and materials shall first have been processed by grinding or other adequate means, and the viability of all such weed seeds therein destroyed provided, unprocessed screenings or offal materials may be sold to a commercial processor or commercial feed mixer for processing.