U.S. Customs and Border Protection's Oversight of the Permit to Transfer Process for Cargo Containers [open pdf - 354KB]
This Department of Homeland Security (DHS) Office of Inspector General (OIG) report provides information on the OIG's evaluation of DHS' current targeting system for international intermodal cargo containers. This year's evaluation focused on "determining whether CBP's permit to transfer (PTT) process has effective controls in place to ensure that the U.S. Customs and Border Protection (CBP) secures and inspects all identified high-risk containers."
Department of Homeland Security, Office of Inspector General, Report No. OIG-11-28
United States Department of Homeland Security, Office of Inspector General: http://www.dhs.gov/xoig/