A “coram nobis” appeal is a legal procedure used to challenge a criminal conviction or sentence after all other legal avenues for relief have been exhausted. It is a form of post-conviction relief available in some U.S. states and federal and military courts.
Coram nobis appeals are generally limited to situations where there is newly discovered evidence that was not available at the time of trial or sentencing or where there was a fundamental error in the original trial that has since been revealed. The appeal aims to correct errors that would have changed the outcome of the case if they had been known at the time of the original trial.
The jurisdiction for coram nobis appeals varies depending on the jurisdiction where the original conviction occurred. In some states, the appeals are filed in the same court that originally heard the case, while in other states, they are filed in a higher court. In federal court, coram nobis appeals are filed in the same court that originally heard the case, and the jurisdiction is determined by the location of that court. In courts-martial, a coram nobis petition is usually filed with the court of criminal appeals.