John le Carré knows spy craft. A master of espionage fiction, he also once served as an intelligence officer in Britain’s MI5. In a recent interview with Terry Gross of NPR’s “Fresh Air,” while promoting “A Legacy of Spies,” le Carré discussed the art of interrogation. He expressed his firm conviction that the “rough stuff” we hear about today (say, waterboarding and torture) is “quite useless,” not to mention immoral. Why? People under such pressure and pain will basically say anything to make the pain stop.

“I’ve found that trying to understand people, trying to befriend them, trying to indicate that…

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