45 C.F.R. § 73.735-101
To assure that the business of the Department of Health and Human Services (HHS) is conducted effectively, objectively, and without improper influence or the appearance of improper influence, employees and special Government employees must be persons of integrity and must observe high standards of honesty, impartiality, and behavior. They must not engage in any conduct prejudicial to the Government and must avoid conflicts of private interests with public duties and responsibilities. In accord with these principles, the regulations in this part are issued to inform HHS employees and special Government employees what standards of conduct are expected of them in performing their duties and what activities are permitted or prohibited both while they are employed and after their employment with the Department is ended.
45 C.F.R. § 73.735-101