(2) Upon complaint, properly filed, that unshelled walnuts or unshelled filberts are offered for sale or shipment in violation of ORS 632.516 to 632.625, the State Department of Agriculture shall make the necessary investigation. If the complaint is found true, the department shall report the facts to the district attorney of the county in which the violation occurred and the district attorney shall prosecute such offender.
(3) Certificates of inspection of unshelled walnuts and unshelled filberts issued by the department shall be prima facie evidence of the facts contained therein.