From Human Rights Watch
http://hrw.org/english/docs/2004/05/05/iraq8547.htmCan contractors be prosecuted under U.S. military law?
U.S. civilians can only be tried by U.S. courts-martial during a declared war. As a US military field manual states: “Contractor employees are not subject to military law under the UCMJ
when accompanying US forces, except during a declared war. Maintaining discipline of contractor employees is the responsibility of the contractor’s management structure, not the military chain of command.”
Can contractors be prosecuted under U.S. federal law?
Contractors may be prosecuted, depending on the offense. Military contractors who are U.S. nationals could be prosecuted by a U.S. federal court under the U.S. War Crimes Act of 1996 (18 U.S.C. 2441). The act defines a war crime as any grave breach of the 1949 Geneva Conventions (such as torture or inhuman treatment) or any violation of common article 3 of the Geneva Conventions (which not only includes torture, but also “outrages upon personal dignity” and “humiliating and degrading treatment”). Penalties include fines or imprisonment for life or any term of years, and the death penalty if death results to the victim.
Contractors might also be prosecuted under the Military Extraterritorial Jurisdiction Act of 2000 (Public Law 106-778), known as MEJA. This law permits the prosecution in federal court of U.S. civilians who, while employed by or accompanying U.S. forces abroad, commit certain crimes. Generally, the crimes covered are any federal criminal offense punishable by imprisonment for more than one year. MEJA authorizes Defense Department law enforcement personnel to arrest suspected offenders and specifies procedures for the transfer of accused individuals to the United States.
Prosecutions under the Military Extraterritorial Jurisdiction Act would be handled by federal civilian authorities.
The MEJA law appears to be untested to date. It was enacted primarily to protect U.S. soldiers and their dependents living abroad. One problem facing the U.S. military at its foreign bases was that military contractors could commit crimes with virtual impunity since local authorities would have little interest in prosecuting a U.S. citizen committing a crime against another U.S. citizen on a U.S. military base.