It has been known for a long time that torture is a poor way of gathering intelligence. People will say anything to they believe the torturers want to hear to get them to stop.
“The CIA described [its program] repeatedly both to the Department of Justice and eventually to Congress as getting unique, otherwise unobtainable intelligence that helped disrupt terrorist plots and save thousands of lives,” said one U.S. official briefed on the report. “Was that actually true? The answer is no.”
http://www.washingtonpost.com/world...75a82a-b8dd-11e3-96ae-f2c36d2b1245_story.html