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NZYQ v Minister for Immigration, Citizenship and Multicultural Affairs [2023] HCA 37

Overview

NZYQ v Minister for Immigration, Citizenship and Multicultural Affairs (2023) concerned the constitutional limits on the executive power to detain non-citizens under the Migration Act 1958 (Cth).

The plaintiff, known by the pseudonym NZYQ, was a stateless non-citizen who had been convicted of serious criminal offences. Following the completion of his sentence, he remained in immigration detention because there was no real prospect of his removal from Australia in the foreseeable future.

NZYQ challenged the lawfulness of his continued detention, arguing that indefinite executive detention in circumstances where removal was not reasonably practicable exceeded constitutional limits.

Constitutional Significance

The High Court held that the Migration Act did not authorise indefinite detention where there is no real prospect of removal becoming practicable in the reasonably foreseeable future. To construe the Act as permitting such detention would raise serious constitutional concerns under Chapter III.

The decision effectively overruled Al-Kateb v Godwin (2004), which had previously upheld the validity of indefinite immigration detention.

NZYQ reaffirmed the principle that executive detention must be strictly limited to what is reasonably necessary for a non-punitive purpose, such as processing a visa application or effecting removal. Where detention ceases to serve such a purpose, it becomes punitive in substance and cannot be sustained without breaching constitutional limits on executive power.

The case represents a major modern development in the constitutional law of executive detention in Australia.