Torture does not work, ask the CIA

In the LA Times, from an ex-CIA counter-terrorism chief, it's all explained here: what John McCain and 89 other senators already know.

If you inflict enough pain on someone, they will give you information, but what they tell you may not be true. You will have to corroborate it, which will take time. And, unless you kill every suspect you brutalize, you will make enemies of them, their families, maybe their entire villages. What real CIA field officers know firsthand is that it is better to build a relationship of trust — even with a terrorist, even if it's time-consuming — than to extract quick confessions through tactics such as those used by the Nazis and the Soviets, who believed that national security always trumped human rights.