FM 34-52 Intelligence Interrogation, the United States Army field manual, explains that torture βis a poor technique that yields unreliable results, may damage subsequent collection efforts, and can induce the source to say what he thinks the interrogator wants to hear.β[4] Not only is torture ineffective at gathering reliable information, but it also increases the difficulty of gathering information from a source in the future.
Going by the links on Wikipedia. A quote: