After reading this USA Today piece, the phrase “needle in a haystack” comes to mind:
The [US] government’s terrorist watch list has swelled to more than 755,000 names, according to a new government report that has raised worries about the list’s effectiveness.
The size of the list, typically used to check people entering the country through land border crossings, airports and sea ports, has been growing by 200,000 names a year since 2004.
[snip]
Leonard Boyle, director of the FBI’s Terrorist Screening Center, which maintains the list, says in testimony to be given today that 269 foreigners were denied entry in fiscal 2006.