Extending Limits of U.S. Customs Waters Act

This bill updates legal definitions in customs law to replace the outdated "four leagues" standard with current international law boundaries. It clarifies that U.S. customs enforcement applies to waters within the U.S. territorial sea (up to 12 nautical miles, as defined in Presidential Proclamation 5928) and contiguous zone (up to 24 nautical miles, as defined in Proclamation 7219). The change directly affects U.S. Customs and Border Protection's maritime enforcement operations but does not alter the actual geographic scope of enforcement areas. The bill amends the Tariff Act of 1930 and the Anti-Smuggling Act to align their language with existing international law standards.