Furthermore, the so-called "Medina standard" clarified the U.S. law to clearly also encompass U.S. officers, so that those as well as foreign officers such as General Yamashita can be prosecuted in the United States. The "Medina standard" is based upon the 1971 prosecution of U.S. Army Captain Ernest Medina in connection with the My Lai Massacre during the Vietnam War. It holds that a U.S. commanding officer, being aware of a human rights violation or a war crime, will be held criminally liable if he does not take action. However, Medina was acquitted of all charges.