§ 3211.
The Vice President, Members of Congress, the Secretary of the Senate, the Sergeant at Arms of the Senate, each of the elected officers of the House of Representatives (other than a Member of the House) during the 90-day period immediately following the expiration of their respective terms of office, may send and receive as franked mail all public documents printed by order of Congress.
([Pub. L. 91–375], Aug. 12, 1970, [84 Stat. 754]; [Pub. L. 93–191, § 2], Dec. 18, 1973, [87 Stat. 741]; [Pub. L. 97–69, § 5(a)], Oct. 26, 1981, [95 Stat. 1043].)