Disturbing new questions have been raised about the role of doctors and other medical professionals in helping the Central Intelligence Agency subject terrorism suspects to harsh treatment, abuse and torture. The Red Cross previously documented, from interviews with "high-value" prisoners, that medical personnel helped facilitate abuses in the C.I.A.'s "enhanced interrogation program" during the Bush administration. Now Physicians for Human Rights has suggested that the medical professionals may also have violated national and international laws setting limits on what research can be performed on humans. The group's report focused particularly on a few issues where medical personnel played an important role " determining how far a harsh interrogation could go, providing legal cover against prosecution and designing future interrogation procedures. In the case of waterboarding, a technique in which prisoners are brought to the edge of drowning, health professionals were required to monitor the practice and keep detailed medical records. Their findings led to several changes, including a switch to saline solution as the near-drowning agent instead of water, ostensibly to protect the health of detainees who ingest large volumes of liquid but also, the group says, to allow repeated use of waterboarding on the same subject.