49 C.F.R. § 1103.24 Use of adverse witnesses.
Title 49 - Transportation
A practitioner shall not be deterred from seeking information from a witness connected with or reputed to be biased in favor of an adverse party, if the ascertainment of the truth requires that such a person be called as a witness in a proceeding.
Title 49: Transportation
PART 1103—PRACTITIONERS
Subpart B—Canons of Ethics
The Practitioner's Duties and Responsibilities Regarding Witnesses, Other Litigants and the Public
§ 1103.24 Use of adverse witnesses.