You're correct, torture is not effective. Pulling someone's fingernails out is just as likely to produce lies as truth. The things described above aren't torture. They're discomfort. Keeping someone awake for days tends to screw with their determination. Sitting in uncomfortable temperatures can do the same. Anything that causes a person to lose focus can be useful in getting information. That information shouldn't be immediately believed without some verification, but it certainly is a start.
Ask any law enforcement officer.
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Getting knocked down is no sin, it's not getting back up that's the sin
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