Thomas v Mowbray & Ors

The High Court of Australia considered the case of Thomas v Mowbray & Ors, brought by the applicant, Thomas, against the respondents, Mowbray and others. The dispute concerned the validity of a control order made against Thomas under the *Security Legislation Amendment (Terrorism) Act 2002* (Cth). Thomas sought to challenge the constitutional validity of the provisions of the Act that permitted the making of such orders.

The central legal issue before the High Court was whether the provisions of the *Security Legislation Amendment (Terrorism) Act 2002* (Cth) authorising the making of control orders were invalid by reason of contravening Chapter III of the Australian Constitution, specifically the separation of powers doctrine and the implied prohibition on the conferral of judicial power on non-judicial bodies. The Court was required to determine whether the executive power of the Commonwealth, as exercised by the Attorney-General in seeking a control order, could be exercised in a way that significantly curtails the liberty of an individual without the safeguards of a criminal trial, and whether the judicial role in confirming such orders was consistent with the constitutional framework.

The majority of the High Court held that the provisions of the *Security Legislation Amendment (Terrorism) Act 2002* (Cth) were constitutionally valid. The Court reasoned that the power to make control orders was an exercise of the executive power of the Commonwealth, directed towards protecting national security. While acknowledging the significant impact on individual liberty, the majority found that the scheme did not impermissibly vest judicial power in the executive, nor did it contravene the separation of powers. The judicial role in confirming a control order, requiring a satisfaction of reasonable suspicion, was considered to be a limited judicial function that did not usurp the core functions of the judiciary. The Court distinguished the conferral of judicial power from the exercise of executive power that might have consequences for individuals.

The High Court dismissed the application.