Border and Transportation Security: The Complexity of the Challenge [March 29, 2005] [open pdf - 96KB]
From the Summary: "The search for border and transportation security is a complex task. For example, internationally shipped cargoes travel in various conveyances on a variety of infrastructures, through a number of places, are held in the custody of numerous people and organizations, and can involve up to 40 separate documents to complete the journey from the source zone to the distribution zone. This report suggests that if the border can be envisioned not merely as a physical boundary but rather as a flexible concept that allows for the possibility that the border begins at the point where goods or people commence their U.S.-bound journey, a significantly wider array of options for border management policies becomes available."
CRS Report for Congress, RL32839