Constables in the United States
While Constables primarily serve the Courts, they belong to the executive branch of government.
Administrative Appeals Tribunal
The Tribunal is not a court. The High Court has long held that the Australian Constitution, mandates a separation of powers between the executive, legislative and judicial branches of government. Judicial review of administrative decisions takes place in courts, such as the Federal Court and the Federal Circuit Court. The AAT remains part of the executive branch of government.