"Each year, about 12 million shipping containers
enter U.S. ports. After the September 11, 2001, attacks,
concern arose that terrorists might use containers to
smuggle weapons of mass destruction—particularly
nuclear weapons—into the country. To reduce that
threat, the federal government implemented several
security measures. Among them, Customs and Border
Protection (CBP), an agency of the Department of
Homeland Security (DHS), scans every container entering
the United States by sea or land to detect radiation.1
CBP also identifies about 5 percent of all incoming
seaborne containers as high risk, and it inspects those
containers with X-ray or gamma-ray imaging systems.
The agency opens and examines containers if the images
suggest that the cargo is potentially dangerous or does not
match the manifest..."
Shipping containers
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