While the "I didn't know" stance could be true to a certain level or degree this article seems to raise the bar:
Quote: "Iraqis held by U.S. forces have been subjected to systematic degrading treatment, sometimes close to torture, that may have been officially condoned, the International Committee of the Red Cross said Friday."
http://story.news.yahoo.com/news?tmpl=story&cid=574&ncid=721&e=1&u=/nm/20040507/wl_nm/iraq_abuse_redcross_dc