5 U.S.C. § 13144: Limitations on outside employment

receive compensation for affiliating with or being employed by a firm, partnership, association, corporation, or other entity which provides professional services involving a fiduciary relationship; permit that Member’s, officer’s, or employee’s name to be used by any such firm, partnership, association, corporation, or other entity; receive compensation for practicing a profession which involves a fiduciary relationship; serve for compensation as an officer or member of the board of any association, corporation, or other entity; or receive compensation for teaching, without the prior notification and approval of the appropriate entity referred to in section 13142 of this title . when received by a justice of the United States retired from regular active service under section 371(b) of title 28 ; when received by a judge of the United States retired from regular active service under section 371(b) of title 28 , for teaching performed during any calendar year for which such judge has met the requirements of subsection (e) of section 371 of title 28 , as certified in accordance with such subsection; or when received by a justice or judge of the United States retired from regular active service under section 372(a) of title 28 . For purposes of this section, the relationship between a Member who is a Representative in, or Delegate or Resident Commissioner to, the Congress and who is providing care directly to a patient in the form of medical services or dental services and the patient to whom such care is provided shall not be considered a fiduciary relationship.