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I think that there's sufficient evidence to convene a Grand Jury on the issue.
A Grand Jury- as opposed to a softball Congressional committee hearing where none of the questioners do a follow-up to Donald Rumsfeld on the mystery of how it is that while the revelations of abuse had been publically known since January 2004, and General Taguba completed his full report on the Abu Ghraib atrocities in March 2006, two months prior to Rumsfeld's testimony before the committee- but that Rumsfeld (if his testimony is not perjurious) apparently either never once requested a copy of the report on this high-profile scandal, or never wondered how it was so long in reaching his personal attention; and according to extant accounts, never once requested a personal meeting with General Taguba or obtained a copy of his findings- until the night before Rumsfeld's scheduled appearance before Congress.
I note that both Charles Graner and other military personnel have made reference to the actions of Americans working for "OGA" (an acronym denoting a non-military agency so secret that it was not allowed to be named in reports) in the same facilities where they worked, using tactics so severe that they allegedly sometimes resulted in detainee deaths; and that Graner and others undoubtedly drew the inference that the traditional limits in which they had previously been instructed were no longer in operation.
In the absence of a criminal investigation, of course, there's no way to determine the full extent of Bush, Cheney and Rumsfeld's culpability in these matters- or in the possible destruction of evidence bearing on that matter. But the record is clear that- among other facts- Bush, Cheney, and Rumsfeld lifted the limits of permissible interrogation tactics used on detainees at Guantanamo Bay; that the commander of Guantanamo Bay's Camp Delta & X-Ray and some of the same interrogators at Guantanamo- including OGA personnel- were later transferred to work in the prisons operated by the military in Iraq, such as Abu Ghraib; that the warden of Abu Ghraib prison, Janis Karpinski, claims that she was ordered by her superiors not to visit some sections of the facility for which she ostensibly had responsibility, to the point where she didn't even possess keys to the off-limits wards...
I find that last detail to be especially worthy of note, both because it's so little known, and because of what it implies- that those above her in the chain of command felt a pressing need to hide something from her. It's also remarkable that- correct me if I'm wrong- Brig. Gen. Karpinski was the highest-ranking officer to receive any administrative discipline in the Abu Ghraib affair. She got a reprimand and reduction in rank, which effectively ended her military career and led to her retirement shortly thereafter. She and Charles Graner fill out two ends of a continuum, so to speak.
By contrast, Karpinski's immediate superior, Maj. Gen. Geoffrey Miller, received no official punishment- although he did opt for a hasty retirement- which was (according to a story in the Washington Post) complicated by the fact that some Senators insisted that he drop an invocation of Fifth Amendment protection, in order to testify before a Congressional Committee, before he would be allowed to do so. "Discrepancies" have since been found in some of his testimony before Congress- but thus far, Miller has not been pursued for criminal perjury. He was allowed to retire- in fact, at his retirement ceremony on July 31, 2006, he was awarded the Distinguished Service Medal, and praised as "an innovator."
http://en.wikipedia.org/wiki/Geoffrey_D._Miller
[link at sig]
(Yes, I know it's Wikipedia- but this entry is quite well-referenced. Links aplenty, in fact.)
Those are just a few of the germane details, easily gleaned from unclassified sources in the public record, Elephantman. I can find more.