"Since 9/11, we have been engaged in a struggle against an elusive enemy; terrorists work in the shadows, relying on secrecy and the element of surprise to maximize the impact of their attacks. Timely and accurate intelligence is crucial to success in the War on Terrorism. One of the key tools in this war has been the information we have gleaned from the terrorists themselves. Detainees who have been in the inner circle of al-Qa'ida, occupying some of the most important positions in that organization, hold information that simply cannot be obtained from any other source."
Federation of American Scientists: http://www.fas.org/