(a) Any person interviewed in any manner by the NTSB has the right to be accompanied during the interview by no more than one representative of the witness's choosing. The representative -
(1) May be an attorney;
(2) May provide support and counsel to the witness;
(3) May not supplement the witness's testimony; and
(4) May not advocate for the interests of a witness's other affiliations.
(b) An investigator conducting the interview may take any necessary action (including removal of the representative from the interview) to ensure a witness's representative acts in accordance with the provisions of paragraph (a) of this section during the interview, and to prevent conduct that may be disruptive to the interview.