The Yemen Toner Cartridge Bomb Plot emphasises the ease of attacking  civil aviation transportation by using a regular cargo shipment that is loaded on passenger flights With over 22% of US domestic air cargo travelling on passenger planes1, unscreened cargo is currently a major transportation security risk.
The Department of Homeland Security’s  (TSA) has set a December 3, 2012 deadline, which requires passenger air carriers to conduct 100 percent cargo screening on international inbound flights.
Screening Air Cargo in a fashion similar to checked baggage inspection is not feasible, as has been emphasized both by Cargo and Transport officials, prompting the TSA to postpone their directive date, time and time again.