Senior defense officials have described the CIA practice of hiding unregistered detainees at Abu Ghraib prison as ad hoc and unauthorized, but a review of Army documents shows that the agency's "ghosting" program was systematic and known to three senior intelligence officials in Iraq. The most recent Pentagon review of detainee abuse found 30 cases in which prisoners were held off the books, including one kept secretly for about 45 days. Army Documents Shed Light on CIA 'Ghosting' | 
