1. No person shall be tried before a national court for acts constituting serious violations of international humanitarian law under the present Statute, for which he or she has already been tried by the International Tribunal.
2. A person who has been tried by a national court for acts constituting serious violations of international humanitarian law may be subsequently tried by the International Tribunal only if:
(a) the act for which he or she was tried was characterized as an ordinary crime; or
(b) the national court proceedings were not impartial or independent, were designed to shield the accused from international criminal responsibility, or the case was not diligently prosecuted.
3. In considering the penalty to be imposed on a person convicted of a crime under the present Statute, the International Tribunal shall take into account the extent to which any penalty imposed by a national court on the same person for the same act has already been served.