This is an interesting area.
It is agreed that threats of torture can backfire ... when the US indicated that an Egyptian man's wife and children would be tortured unless he admitted to being a terrorist, the man did what any decent family man would do .. he lied to the US forces and gave them false information.
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How much money and resources was wasted because of his sensible response to the torture threat?
Obviously we can all come up with a scenario where torture would work in a specific case ... but the real question is whether it is a useful tool. If I had a job opening locked cars, I could justify carrying a jackhammer for the task on the grounds of being able to come up with an imaginary scenario where it was vital to save a life ... but surely when every time I used the jackhammer and it made the situation worse, then my employers would soon ban jackhammers?
However, loth though I am to admit it, perhaps there have been situations where military objectives were helped by having the 'torture' card in the deck to play. (That doesn't mean that ultimately it would be better not to play it .. just that it might have been useful in the past)
After about 24 hours, whatever the prisoner knows would be outdated info.
Unfortunately this isn't always correct.
Look at the capture of Saddam Hussein, for example. The intel that led to his capture was obtained from what US forces described rather euphemistically as 'hostile questioning' of prisoners several weeks before he was captured.
In that example, clearly the information that the prisoners knew was not out of date in 24hrs.
If the US had never used 'hostile questioning' of the prisoners, perhaps he would not have been captured.
As pointed out in an earlier link, threats of torture was also successfully by US forces in other wars, such as the Vietnam War.
So when he captured a Vietcong soldier who could warn of ambushes and lead them to hidden troops but who refused to speak, wires were attached to the man's scrotum with alligator clips and electricity was cranked out of a 110-volt generator.
"It worked like a charm," Cowan told me. "The minute the crank started to turn, he was ready to talk. We never had to do more than make it clear we could deliver a jolt. It was the fear more than the pain that made them talk."
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It was also used effectively by the Marquis groups of the French Resistance in the Second World War. Nancy Wake (the liaison between one of the Marquis group and the UK military) mentioned in her autobiography that it was common to torture German collaborators before killing them ... as information was vital. She found the approach of questioning a prisoner under torture before putting a gun against their head and blowing their brains out was so obvious that any other action was naive and laughable .. it was one of her objections of the film made about her.
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Obviously I don't have the personal experience to say whether the information the Marquis got was useful ... but it would seem that they were the experts on the subject of their own situation and found it useful.
As a counter example, Lt Col Oreste Pinto found that the method wasn't useful .. and he was also clearly an expert of the same war.
Sometimes reality doesn't conform to what I would like reality to be.
Mac