There's an article in the American Prospect titled "Unusual Suspects" on the treatment of female detainees in Abu Ghraib as well as a related lawsuit filed against the two contracting companies that provided interrogators (CACI and Triton).
There's plenty that's unclear here - particularly the role of the civilian interrogators, their liability, the degree of mistreatment suffered by women, and whether or not there was incidental or widespread sexual abuse. What is clear is that there was mistreatment, that many women were detained not because of their own actions but because of their relationship to a man in whom the US had interest. It's the old canard, "guilt by association", that holds no water here but was deemed sufficient cause to detain women in what may have been horrific conditions and subject them to what may have been horrific treatment.
Did we violate the Geneva Conventions? Absolutely. The conventions limit punishment to actions committed by the individual, not actions committed by someone the individual knows or is related to. So before we even determine if abusive treatment, either physical or sexual, occurred and violated the Conventions, we're already in violation.
These women suffered at our hands because of who they know. They were guilty by association. We are too. It's our country, our brethren, our military that's responsible for this treatment. And it's being done in our name. We should feel guilt by association. The lack of outrage here tells me that we should own that guilt. But it's that very lack of outrage that tells me the guilt isn't felt, that instead of figuring out who did what and holding them accountable under the law, we'd much rather think "boys will be boys" and let this issue fade from our national attention. It is our disgrace if we do so. I fear we will.