United States Department of Justice, The NSA Program to Detect and Prevent Terrorist Attacks
“ The FISA process makes perfect sense in almost all cases of foreign-intelligence monitoring in the United States. Although technology has changed dramatically since FISA was enacted, FISA remains a vital tool in the war on terrorism -- one that we are using to its fullest and will continue to use against al Qaeda and other foreign threats. But the terrorist surveillance program operated by the NSA requires maximum speed and agility to achieve early warning, and even a very brief delay may make the difference between success and failure in detecting and preventing the next attack. ”
