Reuters reports today that a nearly three-year long investigation by the Senate Intelligence Committee has found little or no evidence that “enhanced interrogation” techniques yielded any valuable intelligence, or led to counter-terrorism breakthroughs.

People familiar with the inquiry said committee investigators, who have been poring over records from the administration of President George W. Bush, believe they do not substantiate claims by some Bush supporters that the harsh interrogations led to counter-terrorism coups.

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.

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.