James Mitchell authored the book, "Enhanced Interrogation," which is an insider's view of the enhanced interrogation techniques used by the CIA on terrorists.
He was on CSPAN the other day, and that program will be re-run Monday, 1/30/2017, from 3am til 4:30am Central on CSPAN2. If that's inconvenient, visitors who don't mind allowing CSPAN2 to plant cookies, it can be watched at this link.
I'm currently reading his book which I'll go into at a later date. But for starters, he provides some valuable lessons about EITs. First, they work. Second, they were used by the CIA not to punish, but to obtain intelligence that would prevent future attacks. So when politicians get high and mighty about EITs, it's useful to remember that the alternative might be a terrorist attack.
Set your VCR.