Washington Post: Ghost Detainees Have been Removed from Iraq in the last six months (which means AFTER Abu Ghraib broke on April 30).
The 1949 treaty notes that a violation of this particular provision constitutes a "grave breach" of the accord, and thus a "war crime" under U.S. federal law, according to a footnote in the Justice Department draft. "For these reasons," the footnote reads, "we recommend that any contemplated relocations of 'protected persons' from Iraq to facilitate interrogation be carefully evaluated for compliance with Article 49 on a case by case basis." It says that even persons removed from Iraq retain the treaty's protections, which would include humane treatment and access to international monitors.
It's here.