49 C.F.R. § 845.26 Evidence.
Title 49 - Transportation
The chairman of the board of inquiry shall receive all testimony and evidence which may be of aid in determining the cause of accident. He may exclude any testimony or exhibits which are not pertinent to the investigation or are merely cumulative.
Title 49: Transportation
PART 845—RULES OF PRACTICE IN TRANSPORTATION; ACCIDENT/INCIDENT HEARINGS AND REPORTS
Subpart B—Conduct of Hearing
§ 845.26 Evidence.

