"I posted a thread about Maj. Sherwood Moran, wno was the most effective interrogator of WWII. His techniques got results. Torture free ..."
Thanks for the info.
And on the other side of the world Cpl. Hanns Scharff was using the same techniques interrogating allied pilots shot down over Germany. See:
The Interrogator: The Story of Hanns Scharff, Luftwaffe's Master Interrogator 1978 by Raymond F. Toliver and Hanns J. Scharff
More recently FBI agent Ali Soufan got excellent information until his subject was turned over to CIA contractors. As soon as the rough stuff started the prisoner clammed up. See:
The Black Banners: The Inside Story of 9/11 and the War Against al-Qaeda Sep 12, 2011 by Ali H. Soufan and Daniel Freedman
The professionals knew how to get results but the upper levels of government has a tendency to be populated with incompetent amateurs.