Columbia subject headings:
Drug abuse--United States.
Drug control--Technological innovations--United States.
Drug control--United States.
Drug enforcement agents--United States.
Smuggling--United States.
Harvard subject headings:
Drug control--United States
Drug enforcement agents--United States.
Smuggling--United States
Princeton subject headings:
Drug abuse--United States.
Drug control--United States.
Drug enforcement agents--United States.
Smuggling--United States.