46 U.S.C. § 6303
Rights of parties in interest
In an investigation conducted under this chapter, the following shall be allowed to be represented by counsel, to cross-examine witnesses, and to call witnesses:
(1)
an owner,
(2)
any holder of a license or certificate of registry,
(3)
any holder of a merchant mariner’s document,
(4)
any other person whose conduct is under investigation, and
(5)
any other party in interest.
( Pub. L. 98–89 , Aug. 26, 1983 , 97 Stat. 537 .)