14 CFR 300.11 - Disqualification of Government officers and employees.
No officer or employee of the Federal Government, other than a “special Government employee” as defined in 18 U.S.C. 202, shall represent anyone, otherwise than in the proper discharge of his or her official duties, in any DOT proceeding or matter in which the United States is a party or has a direct and substantial interest.
Title 14 published on 2013-01-01
no entries appear in the Federal Register after this date.