Physicians for Human Rights reports that the Bush administration was conducting research on human subjects, to develop more effective "enhanced interrogation" techniques:
In the most comprehensive investigation to date of health professionals' involvement in the CIA's "enhanced" interrogation program (EIP), Physicians For Human Rights has uncovered evidence that indicates the Bush administration apparently conducted illegal and unethical human experimentation and research on detainees in CIA custody. The apparent experimentation and research appear to have been performed to provide legal cover for torture, as well as to help justify and shape future procedures and policies governing the use of the "enhanced" interrogation techniques. The PHR report, Experiments in Torture: Human Subject Research and Evidence of Experimentation in the ‘Enhanced' Interrogation Program, is the first to provide evidence that CIA medical personnel engaged in the crime of illegal experimentation after 9/11, in addition to the previously disclosed crime of torture.
This evidence indicating apparent research and experimentation on detainees opens the door to potential additional legal liability for the CIA and Bush-era officials. There is no publicly available evidence that the Department of Justice's Office of Legal Counsel determined that the alleged experimentation and research performed on detainees was lawful, as it did with the "enhanced" techniques themselves.