John Kiriakou

And so if word leaked out about prison A, well, by then, all the prisoners had been moved to prison B.

Khalid Sheikh Mohammed is probably the best example here.

He confessed to, for example, murdering Daniel Pearl.

Daniel Pearl was a Wall Street Journal reporter who came to Pakistan in early 2002.

He was there to meet with a Pakistani extremist with whom he had been emailing for about six months.

He went on to do the interview and months later, his head was found in a vacant lot and his torso was found on the other side of town.

Well, we know who killed Daniel Pearl.

He was arrested, he confessed, he pointed the Pakistani authorities to Daniel Pearl's torso, and he was sentenced to life in prison.

But Khalid Sheikh Mohammed, during torture at the hands of CIA officers, also confessed to killing Daniel Pearl.

We knew he didn't kill Daniel Pearl, but the torture was so severe, he was telling his CIA interviewers, interrogators, anything that he thought they wanted to hear just to get them to stop torturing him.

Waterboarding has received the most media attention.

It's actually quite simple.

You strap a prisoner to a board.

His feet and legs are elevated compared to his face.

Cloth or burlap or something is put in his mouth to keep him from drowning.

And while his head is immobilized, water is poured on his mouth.

So, of course, water is going to get

through the cloth and get down your throat, and it makes you feel like you're drowning.

It causes panic.

You tense your muscles to the point where it becomes painful.