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I still haven't read Janis Karpinski's book yet, so I'm presently not clear on exactly who it was who was her immediate superior in the chain of command up to the point when the scandal broke, or who it was who ordered her to stay away of some sections of the prison after nightfall, and declined to provide her with an entrance key (or code) to at least one of the cell blocks in Abu Ghraib.
But if Gen. Karpinski's allegations have merit to them, there was definitely something going on there, beyond a small group of unsupervised renegades abusing their designated authority.