[Iraq]: AMONG THE MANY disturbing aspects of the abuse at Abu Ghraib prison is the involvement of private contractors in conducting interrogations...Their growing involvement...was brought home horrifically in March with the murder and mutilation of four security guards employed by Blackwater USA...Maj. Gen. Antonio M. Taguba, who investigated conditions at Abu Ghraib...found that...a contract interrogator for CACI International Inc..."clearly knew his instructions equated to physical abuse".