[hawkiye]

"CBP uses intelligence and a risk-based strategy to screen information on 100% of cargo before it is loaded onto vessels destined for the United States. All cargo that is identified as high risk is inspected, either at the foreign port or upon arrival into the U.S."

As seen in the above quote it seems you have missed a few qualifications of what they mean when they say "scan 100%" and "all cargo". They scan 100% of what they determine as High Risk which means they check manifests to determine high risk. Also it is not all scanned before it gets to US ports some if it is done AFTER it gets here.

[cripplecreek]

Apparently it's a bit like defining what "is" is.