Columbia subject headings:
Boats and boating--Law and legislation--United States.
Customs inspection--Technological innovations--United States.
Marinas--Law and legislation--United States.
National security--Law and legislation--United States.
Ports of entry--Security measures--Technological innovations--United States.
Harvard subject headings:
Boats and boating--Law and legislation--United States
Customs inspection--Technological innovations--United States.
Marinas--Law and legislation--United States.
National security--Law and legislation--United States
Ports of entry--Security measures--Technological innovations--United States.
Princeton subject headings:
Boats and boating--Law and legislation--United States.
Customs inspection--Technological innovations--United States.
Marinas--Law and legislation--United States.
National security--Law and legislation--United States.
Ports of entry--Security measures--Technological innovations--United States.