An excerpt from the full document, which can be downloaded here:
The requirement to obtain information from an uncooperative source as quickly as possible -- in time to prevent, for example, an impending terrorist attack that could result in loss of life -- has been forwarded as a compelling argument for the use of torture. Conceptually, proponents envision the application of torture as a means to expedite the exploitation process. In essence, physical and/or psychological duress are viewed as an alternative to the more time consuming conventional interrogation process. The error inherent in this line of thinking is the assumption that, through torture, the interrogator can extract reliable and accurate intelligence. History and a consideration of human behavior would appear to refute this assumption.
The application of physical and or psychological duress will likely result in physical compliance. Additionally, prisoners may answer and/or comply as a result of threats of torture.