Waterboarding

From Wikipedia:

The modern practice of waterboarding, characterized in 2005 by former CIA director Porter J. Goss as a "professional interrogation technique," involves tying the victim to a board with the head lower than the feet so that he or she is unable to move. A piece of cloth is held tightly over the face, and water is poured onto the cloth. Breathing is extremely difficult and the victim will be in fear of imminent death by asphyxiation. Journalists Brian Ross and Richard Esposito described the CIA's waterboarding technique as follows:

The prisoner is bound to an inclined board, feet raised and head slightly below the feet. Cellophane is wrapped over the prisoner's face and water is poured over him. Unavoidably, the gag reflex kicks in and a terrifying fear of drowning leads to almost instant pleas to bring the treatment to a halt. According to the sources, CIA officers who subjected themselves to the water boarding technique lasted an average of 14 seconds before caving in. They said al Qaeda's toughest prisoner, Khalid Sheik Mohammed, won the admiration of interrogators when he was able to last over two minutes before begging to confess.

In the United States, military personnel are taught this technique, to demonstrate how to resist enemy interrogations in the event of capture. According to Salon.com, SERE instructors shared their techniques with interrogators at the Guantanamo Bay detainment camp.

Dr. Allen Keller, the director of the Bellevue/N.Y.U. Program for Survivors of Torture, has treated "a number of people" who had been subjected to forms of near-asphyxiation, including waterboarding. An interview for The New Yorker states:

[Dr. Keller] argued that it was indeed torture. Some victims were still traumatized years later, he said. One patient couldn't take showers, and panicked when it rained. "The fear of being killed is a terrifying experience," he said.

On September 6, 2006, the United States Department of Defense released a revised Army Field Manual entitled Human Intelligence Collector Operations that prohibits the use of waterboarding by U.S. military personnel. The revised manual was adopted amid widespread criticism of U.S. handling of prisoners in the War on Terrorism, and prohibits other practices in addition to waterboarding. The revised manual applies to U.S. military personnel, and as such does not apply to the practices of the CIA.