Beginning December 3, 2012, 100 percent of cargo shipments loaded on passenger aircraft on international flights bound for the United States must undergo screening for explosives.

According to the TSA, the screening deadline  builds additional risk-based, intelligence-driven procedures into the prescreening process to determine screening protocols on a per-shipment basis. 

"Harmonizing security efforts with our international and industry partners is a vital step in securing the global supply chain," said TSA Administrator John S. Pistole. "By making greater use of intelligence, TSA can strengthen screening processes and ensure the screening of all cargo shipments without impeding the flow of commerce."