46 U.S.C. § 11506

Carrying sheath knives

A seaman in the merchant marine may not wear a sheath knife on board a vessel without the consent of the master. The master of a vessel of the United States shall inform each seaman of this prohibition before engagement. A master failing to advise a seaman is liable to the United States Government for a civil penalty of $50.

( Pub. L. 98–89 , Aug. 26, 1983 , 97 Stat. 584 .)