A man who conducted interrogation of Iraqis as a contract employee for the U.S. military tell us how it really was in the Washington Post.  Here’s an excerpt:

The lead interrogator at the DIF had given me specific instructions: I was to deprive the detainee of sleep during my 12-hour shift by opening his cell every hour, forcing him to stand in a corner and stripping him of his clothes. Three years later the tables have turned. It is rare that I sleep through the night without a visit from this man. His memory harasses me as I once harassed him.

Despite my best efforts, I cannot ignore the mistakes I made at the interrogation facility in Fallujah. I failed to disobey a meritless order, I failed to protect a prisoner in my custody, and I failed to uphold the standards of human decency. Instead, I intimidated, degraded and humiliated a man who could not defend himself. I compromised my values. I will never forgive myself.