The U.S. Army's Criminal Investigation Division has begun an investigation into this video, which was first posted on IraqSlogger last week.
The clip, originally linked via a now defunct account on YouTube, purports to show a former guard from Abu Ghraib talking about torture techniques employed at the American-run prison. The man also recounts the gang rape of a female teenage detainee, in which one guard "pimped" the girl to others for $50 each. As he recalls, "I think at the end of the day he'd made like 500 bucks before she hung herself."
According to chief of public affairs Christopher Grey, "CID Special Agents are looking into the matter and take this issue very seriously. I am not able to provide you with any further details of our activity at this time due to investigative reasons."
At this point, there is no way to confirm if the video is a true representation or not. The video has no publicly-identifiable source at this point, the primary subject appears almost completely in shadow, and the footage has obviously been edited down into a concise 3-minute package.
Previous soldier/atrocity items have caused great media stir, only later to be proven hoaxes. As Grey noted, "We have seen situations where people post videos and pictures on the Internet pretending or leading people to believe they are U.S. soldiers, when in fact they were not even in the military or they never served in OIF or OEF."
More:
http://www.iraqslogger.com/index.php/post/1079/US_Army_Investigating_New_Torture_Allegations