ghost detainee
n.— «US military policemen moved unregistered Iraqi prisoners, known as “ghost detainees”, around an army-run jail at Abu Ghraib, in order to hide them from the Red Cross, according to a confidential military report.» —“Jailed Iraqis hidden from Red Cross, says US army” by Julian Borger Guardian (U.K.) May 5, 2004. (source: Double-Tongued Dictionary)