According to TSA, the administration has concluded that non-use of the full watch list does not constitute a security vulnerability; however, TSA did not explain the basis for this determination. Also, DHS's Office for Civil Rights and Civil Liberties emphasized that there is a strong argument against increasing the number of watch list records TSA uses to prescreen passengers. Specifically, the office . . . noted that an expansion of the No Fly and Selectee lists could even alert a greater number of individuals to their watch list status, compromising security rather than advancing it.
From the General Accounting Office report, quoted at
http://washparkprophet.blogspot.com/2007/10/terrorist-watch-lists-broken.html/
