No shucked shellfish shall be sold or distributed except where such shellfish have been handled in plants for which a certificate has been issued by the State Board of Public Health under these regulations. Shucked shellfish from other states shall not be sold or distributed unless each lot of shucked shellfish obtained therefrom bears a certificate number designating a certificate of cleanliness and safety issued by the State Department of Health of the state in which the shipment originates acceptable to the California State Department of Public Health.