Seeds and agricultural reports emanating from the Department of Agriculture may be mailed—
(1) as penalty mail by the Secretary of Agriculture; and
(2) during the 90-day period immediately following the expiration of their terms of office, as franked mail by Members of Congress.
(Pub. L. 91–375, Aug. 12, 1970, 84 Stat. 754; Pub. L. 97–69, § 5(b), Oct. 26, 1981, 95 Stat. 1043.)