If you read some Books on what the US POWs went through in Vietnam you find the North Vietnamese invented a new form (or someone gave them the info) of torture that kept you from passing out.
While it did not work 100% either from what I have read it was a rare Person it did not Break.
But, that was combined with the other neglectful treatment they got.

So I am thinking the methods we are using are not as effective because the methods are not as brutal and they are being used on well feed Captives in reasonable Health.

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