In 2004 and 2005, there were some number of detainees who were handed over to a particular Iraqi group known as "Wolf Battalion." (Note: The group is actually called "Wolf Brigade." It had a primetime TV show
At the end of 2005, a US soldier told a detainee that if he didn't talk, "He would be subject to all the pain and agony that the Wolf battalion is known to exact upon its detainees."
A group of Sunnis has, without evidence, accused the Wolf Brigade of torture and other killings.
Human rights groups have claimed that Wolf Brigade has violated the Geneva Conventions by embarrassing their detainees via their TV show.
Takeaway: It sounds like that one interrogator broke the rules by threatening the detainee inappropriately. He should probably be punished. I don't see evidence that any other laws were broken.
and it now appears to be a topic of interest to the UN
UN calls for probe into US inaction on torture | Raw Story
An Austrian human rights lawyer thinks that the UN should look into the US's actions in Iraq? Wow, this comes as a total surprise and has completely changed my perspective on things.