Homeland Security Today - news and analysis - Total Ship Cargo Scanning Impractical, CBP Says

A congressional mandate to scan 100 percent of all shipping containers coming into US ports for nuclear or other harmful material is simply unrealistic and “not a wise investment of taxpayer dollars.” The technology doesn’t yet exist to sufficiently scan all cargo without drastically disrupting port operations. A better plan is to require all cargo from certain “high-risk” countries to be scanned, instead of placing a huge economic burden on the world’s port systems.