That's why torture isn't done in the way you think of. They recieve sessions of torture, when they give information, the information is confirmed. This can be confirmed by a variety of interviews with officials over the years, most notably there is a video on youtube of Morning Joe where Joe challenges an intelligence official over torture in that he has been told by intelligence officials off the record that it does give valid information. The official flat out said 'yes but we have not released that information to the public so I cannot say that it does work'. Not hard to find the video on youtube.