When an adolescent under the age of 18 is accused of a criminal offense, he or she is typically tried as a juvenile. This means his or her case is handled by the Illinois Department of Juvenile Justice (IDJJ). However, there are cases in which minors are tried as adults. Sometimes, this is because the charge is one of the offenses that require the defendant to be tried as an adult: first degree murder, aggravated criminal sexual assault, or aggravated battery with a firearm. In other cases, this is because the court has determined that it is appropriate to charge him or her as an adult.