[Code of Federal Regulations] [Title 21, Volume 1] [Revised as of April 1, 2008] From the U.S. Government Printing Office via GPO Access [CITE: 21CFR19.55] [Page 187] TITLE 21--FOOD AND DRUGS CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES PART 19_STANDARDS OF CONDUCT AND CONFLICTS OF INTEREST--Table of Contents Subpart C_Disqualification Conditions Sec. 19.55 Permanent disqualification of former employees. No former Food and Drug Administration employee, including a special government employee, shall knowingly act as agent or attorney for anyone other than United States in connection with any judicial or other proceeding, application, request for a ruling or other determination, contract, claim, controversy, charge, accusation, or other particular matter involving a specific party or parties in which the United States is a party or has a direct and substantial interest and in which he participated personally and substantially through decision, approval, disapproval, recommendation, rendering of advice, investigation, or otherwise as a Food and Drug Administration employee.