The State's Attorneys are also constitutional officers. They have primary jurisdiction over law enforcement matters and the prosecution of criminal matters in the Judicial District where they serve. The State of Connecticut is divided into thirteen Judicial Districts where the vast majority of criminal cases are filed. The most serious cases are handled in the "Part A" courts. Less serious criminal offenses and motor vehicle cases are handled in the "Part B" courts, which are also known as the G.A., or Geographical Area, courts. A Supervisory Assistant State's Attorney oversees the prosecutors in each G.A. court under the direction of the State's Attorney.