Section 6304 provides an officer investigating a marine casualty with the necessary subpena authority to require the attendance and testimony of witnesses and the production of evidence. It also authorizes a district court of the United States to direct compliance with a subpena.

2022—Puspan. L. 117–263 substituted “subpoena” for “subpena” wherever appearing in text, “subpoenas” for “subpenas” in subsec. (d), and, to reflect the probable intent of Congress, “Subpoena” for “Subpena” in section catchline.