>> stripped naked, diapered, physically struck and put in various painful stress positions for long periods of time. they were deprived of sleep for days. in one case, up to 180 hours. >> reporter: one detainee had his lunch pureed and poured into his rectum. he eventually attempted to cut his wrists, chew into his arm and cut a vein in his foot. much of the information kept from president george w. bush's own secretary of state. >> there are cia records stating that colin powell wasn't told about the program at first because there were concerns that, and i quote, powell would blow his stack if he were briefed. >> reporter: a former top cia official says some details were held close, but that the agency did not engage in torture. >> absolutely not. absolutely not.