This part applies to demands and requests to employees for factual, opinion, or expert testimony relating to official information, or for production of official records or information, in legal proceedings in which the United States or the DNFSB is not a named party. However, it does not apply to:

(a) Demands upon or requests for a DNFSB employee to testify as to facts or events that are unrelated to his or her official duties or that are unrelated to the functions of DNFSB;

(b) Demands upon or requests for a former DNFSB employee to testify as to matters in which the former employee was not directly or materially involved while at the DNFSB;

(c) Requests for the release of records under the Freedom of Information Act, 5 U.S.C. 552,or,5.S.C. 552a; and

(d) Congressional demands and requests for testimony or records.