Mind you, we already knew this:

Exclusive: Senate probe finds little evidence of effective "torture" 

Here's how the article gets started:

(Reuters) - "A nearly three-year-long investigation by Senate Intelligence Committee Democrats is expected to find there is little evidence the harsh 'enhanced interrogation techniques' the CIA used on high-value prisoners produced counter-terrorism breakthroughs. 
... 
"The backers of such techniques, which include 'water-boarding,' sleep deprivation and other practices critics call torture, maintain they have led to the disruption of major terror plots and the capture of al Qaeda leaders. 
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"One official said investigators found 'no evidence' such enhanced interrogations played 'any significant role' in the years-long intelligence operations which led to the discovery and killing of Osama bin Laden last May by U.S. Navy SEALs." 

It has been known for a very long time that torture is not useful for obtaining intelligence. It is, rather, quite effective in obtaining false confessions.
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