The Department of Homeland Security has lost track of more than 6,000 foreign nationals who entered the United States on student visas, overstayed their welcome, and essentially vanished -- exploiting a security gap that was supposed to be fixed after the Sept. 11, 2001 terror attacks.
Full story with video HERE.
Correspondent: Brian Ross - World News Tonight
Camera Crew: Dominic Frederico and Shannon Reed
Producer: Matthew Mosk
Air Date: 2 September 2014