Waterboarding. Hypothermia. Stress positions. Prolonged isolation. Sensory deprivation. These "clean" tortures leave deep psychological wounds but few physical scars -- and they have been used for decades not only by dictatorships, but by democratic governments, including the United States.
After 9/11, Americans used these techniques on so-called enemy combatants detained in a system of prisons from Iraq's notorious Abu Ghraib and the Pentagon's detention center at Guant