ALEXANDRIA, Va. (AP) — A civilian contractor sent to work as an interrogator at Iraq’s infamous Abu Ghraib prison resigned within two weeks of his arrival and told his corporate bosses that mistreatment of detainees was likely to continue.

Jurors saw the October 2003 email from Rich Arant, who worked for military contractor CACI, during testimony Wednesday in a lawsuit filed by three Abu Ghraib survivors. The former prisoners are suing CACI, alleging that the Reston-Virginia based company shares responsibility for the mistreatment they endured.

CACI had a contract to supply interrogators to the Army after the 2003 invasion of Iraq, and scrambled to supply the needed personnel. The first CACI interrogators arrived at Abu Ghraib on Sept. 28 of that year.

Arant sent his resignation letter to CACI on Oct. 14. He informed his bosses about his concerns over the handling of prisoners, including what he described as an unauthorized interview of a female inmate by male interrogators. He wrote that “violations of the well-written rules of engagement will likely continue to occur.”