Abdel-Hady v Commonwealth of Australia

The plaintiff, an Austrian citizen with thrombophilia, had his visa cancelled in 2017 and was detained under s 189(1) of the Migration Act 1958 (Cth). From 28 July 2022, a medical episode rendered him unfit for commercial air travel, such that there was no real prospect of his removal becoming practicable in the reasonably foreseeable future. He remained in immigration detention until 13 February 2024. On 8 November 2023, the High Court in NZYQ v Minister for Immigration, Citizenship and Multicultural Affairs [[2023] HCA 37] reopened and overruled the earlier decision in Al-Kateb v Godwin, holding that ss 189(1) and 196(1) of the Migration Act were constitutionally invalid in their application to an unlawful non-citizen whose removal had no real prospect of becoming practicable in the reasonably foreseeable future. The effect was that the plaintiff's detention from 28 July 2022 was not authorised by those provisions. The Commonwealth accepted that the elements of false imprisonment were established and that it was vicariously liable for any liability of the detaining officer. The detaining officer was a Commonwealth public servant who, by reason of Al-Kateb and s 13(4) of the Public Service Act 1999 (Cth), reasonably understood his duty to detain the plaintiff. The question reserved for the Full Court was whether the Commonwealth and its officers had a defence to liability for false imprisonment for the period between 28 July 2022 and 8 November 2023.

• Whether a novel common law defence should be recognised to negative liability for false imprisonment where a Commonwealth officer detained a person in purported performance of a statutory duty in conformity with the law as declared in a prior High Court decision subsequently overruled
• Whether the defence recognised in Queensland v Stradford — protecting officers executing judicial orders from civil liability — extends by analogy to officers acting in purported performance of a statutory duty in conformity with prior judicial reasoning about legislative validity
• Whether the constitutional principles of executive responsibility, the retrospective operation of judicial declarations of invalidity, the rule of law, and the separation of powers preclude recognition of such a defence
• Whether US and Canadian qualified immunity doctrines should be adopted in Australian law for executive officers enforcing laws later found unconstitutional
• Whether s 13(4) of the Public Service Act 1999 (Cth) could provide justification for or excuse of an otherwise tortious act of detention

• ratioNo novel common law defence is available to an officer of the executive government, or to the Commonwealth itself, to negative liability for the tort of false imprisonment where the officer acted in purported performance of a statutory duty to detain in conformity with the law as declared in a prior decision of the High Court which was subsequently overruled. Recognition of such a defence would be inconsistent with constitutional principle. — established [6, 7, 23, 30, 34, 39, 41, 51, 56, 77, 85, 108, 118, 180, 181, 183, 188, 195, 230]
• ratioThe common law defence recognised in Queensland v Stradford — affording protection from civil liability to those who have a legal duty to enforce or execute orders or warrants made by a court in judicial proceedings — is confined to the execution of judicial orders and warrants. It does not extend to the performance of statutory duties, even where the officer acted in conformity with prior judicial reasoning about the validity of the statute. The defence is derivative of judicial immunity and serves the institutional imperative of protecting judicial independence; there is no equivalent imperative for the legislative or executive branches. — limited — confined to execution of judicial orders [42, 43, 44, 64, 65, 66, 67, 68, 69, 70, 74, 75, 76, 77, 160, 161, 162, 163, 164, 165, 166, 167, 192, 193, 196, 199, 200, 201, 204, 205]
• ratioInvalid legislation is, in legal contemplation, as inoperative as though it had never been passed. It confers no rights, imposes no duties and affords no protection. A judicial determination that a statute is invalid operates retrospectively. Prospective overruling is inconsistent with judicial power under Ch III of the Constitution. — applied — settled principle [3, 5, 36, 37, 39, 79, 80, 82, 83, 84, 155, 157, 158, 207, 217]
• ratioThe constitutional responsibility of the executive branch of government to ascertain and comply with the law that limits its power exists at the level of constitutional principle as a corollary of the constitutional incapacity of the executive to dispense with obedience to the law. This responsibility cannot be transformed into an immunity from the consequences of exceeding lawful authority. — applied — settled principle affirmed [1, 31, 32, 33, 34, 88]
• ratioThe Diceyan principle of legal equality requires that every person, including officers of the executive, is subject to the ordinary law of the realm. Recognition of a special immunity from civil liability for officers of the executive acting upon a mistaken understanding of the law would be inconsistent with this principle. — applied — settled principle [88, 122, 168, 177, 178]
• ratioFalse imprisonment is a tort of strict liability. Liability is imposed for intentional deprivation of liberty regardless of the honesty or reasonableness of the defendant's belief in entitlement to act. The tort, alongside habeas corpus, constitutes a constitutional safeguard protecting basic liberties against excesses of state power. — affirmed — settled principle [16, 18, 96, 97, 98, 99, 120, 122, 186, 191, 221, 224]
• ratioNo development of the common law can be inconsistent with constitutional principle. The development of the common law in Australia cannot run counter to constitutional imperatives. — applied — settled principle [7, 85, 216]
• ratioStatutory authority to engage in what otherwise would be tortious conduct must be clearly expressed in unmistakable and unambiguous language. Section 13(4) of the Public Service Act 1999 (Cth), requiring compliance with all applicable Australian laws, cannot provide justification for or excuse of an otherwise tortious act. — applied — settled principle [35, 146, 147, 148]
• ratioJudicial decisions are not statutes; they are evidence of the law but not the enacted law itself. A court's reasons confirming the constitutional validity of a law are not a judicial command. Precedent is the best evidence of the law as enacted but is not the enacted law. — applied — refined in context of proposed defence [76, 81, 123, 147, 148, 155, 165]
• ratioThe qualified immunity of government officials recognised in the United States and Canada is founded upon constitutional contexts fundamentally different from Australia's and provides no basis for the adoption of an analogous doctrine in Australian law. — established — definitively rejected transplantation [47, 48, 49, 50, 109, 115, 116, 117, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 228]
• obiterThe difficulties encountered by officers of the executive when an elaborate enactment is found invalid after a substantial period of administration may to some extent be ameliorated by legislation, but there is no principled basis on which they are to be ameliorated through the development of the common law. — obiter observation [40, 41]
• obiterThe question of whether, absent the propounded defence, the Commonwealth would be directly liable (as opposed to vicariously liable) for the acts of the detaining officer was legally and factually contested, had not been the subject of full argument, and was not determined. — obiter — expressly not decided [21, 22]

• applied [[2023] HCA 37] — The overruling decision (NZYQ) that held ss 189(1) and 196(1) of the Migration Act constitutionally invalid in their application to persons with no real prospect of removal. The present case arose directly from the retroactive effect of that decision on the plaintiff's detention.
• applied extensively Ha v New South Wales [[1997] HCA 34] — Applied across multiple principle areas including the constraint that common law development cannot be inconsistent with constitutional principle, the retrospective operation of judicial declarations of invalidity, and the nature of judicial power under Ch III.
• applied Lange v Australian Broadcasting Corporation ("Political Free Speech case") [[1997] HCA 25] — Applied for the principle that invalid legislation is as inoperative as though it had never been passed, and for the retrospective operation of declarations of constitutional invalidity.
• applied South Australia v Commonwealth ("First Uniform Tax case") [[1942] HCA 14] — Applied at [51] for the general doctrine that when a purported act in the law is invalid for want of or excess of legal power, rights and liabilities are ascertained as if the act had not been attempted.
• applied Giannarelli v Wraith (No 2) [[1991] HCA 2] — Applied for the principle that the executive must be prepared to justify before the ordinary courts the legality of any act interfering with the person or property of the subject, and the constitutional incapacity of the executive to dispense with obedience to the law.
• referred to Puntoriero v Water Corporation [[1999] HCA 45] — Referred to at [33] in the context of executive responsibility to ascertain and comply with the law.
• applied Lewis v Australian Capital Territory (No 8) [[2018] ACTSC 218] — Applied in the context of the strict liability nature of false imprisonment and the irrelevance of good faith belief in lawfulness.
• applied Bird v DP (a pseudonym) [[2023] VSCA 66] — Applied in the context of the distinction between vicarious and direct liability of the Commonwealth.
• referred to Kable v State of New South Wales [[2012] NSWCA 243] — Referred to at [27] in the context of the scope of the proposed defence.

• Migration Act 1958 (Cth) ss 189(1) and 196(1) — Provisions imposing a duty to detain unlawful non-citizens and requiring them to be kept in immigration detention until removal. Held constitutionally invalid in their application to persons with no real prospect of removal becoming practicable in the reasonably foreseeable future, following the overruling of Al-Kateb by [[2023] HCA 37]. The invalidity existed ab initio. [4, 5, 52, 119, 128, 129, 190]
• Public Service Act 1999 (Cth) s 13(4) — Requirement that APS employees comply with all applicable Australian laws. Held not to create a duty of obedience to invalid laws and not to ground a defence to false imprisonment for acts under constitutionally invalid provisions. The 'applicable Australian laws' to which it refers are only those which are valid and applicable. Cannot be construed as providing statutory authority for tortious conduct. [14, 19, 35, 62, 146, 147, 148]
• Constitution Ch III — Separation of judicial power; nature of judicial power including retrospective operation of judicial declarations; basis for the invalidity of ss 189(1) and 196(1) in their application to persons with no real prospect of removal; basis for holding that the proposed defence was inconsistent with constitutional principle. [4, 36, 54, 65, 83, 119, 129, 163, 190, 205, 218]
• Migration Act 1958 (Cth) s 5(1) — Definition of 'officer' under the Migration Act, which includes persons who are not Commonwealth employees. Applied in considering the scope of the proposed defence and the distinction between the detaining officer's status under the Migration Act and the Public Service Act. [5, 12, 13, 139, 143]
• Judiciary Act 1903 (Cth) s 64 — Provision requiring rights of parties in suits involving the Commonwealth to be as nearly as possible the same as between subject and subject. Identified as inconsistent with the recognition of a special immunity for the Commonwealth or its officers. [142, 227]

This decision has immediate and far-reaching consequences. It confirms that the Commonwealth and its officers face strict liability in tort for detention carried out under statutory provisions later declared constitutionally invalid, even where the officer acted in good faith conformity with binding High Court authority. The decision forecloses any common law pathway to qualified immunity for executive officers in Australia, definitively rejecting the transplantation of US and Canadian doctrines. It confines the Stradford defence to the execution of judicial orders and warrants, precluding its extension to officers performing statutory duties. For the cohort of persons detained under the Migration Act in reliance on Al-Kateb prior to the decision in [[2023] HCA 37], the path to damages for false imprisonment is now clear. The Court's observation that the difficulties of administering invalid statutes may be ameliorated by legislation signals that any reform must come from Parliament, not the courts. The decision reinforces the constitutional architecture: the executive bears the risk of acting under laws that may later be found invalid, and no judicial reasoning — however authoritative — can convert that risk into an immunity.

• The Commonwealth has no common law defence — novel or analogous to Stradford — to false imprisonment claims arising from detention under statutory provisions later declared constitutionally invalid, regardless of prior High Court authority upholding those provisions.
• The Stradford defence is now definitively confined to officers executing judicial orders or warrants; it does not extend to officers performing statutory duties, even where prior judicial reasoning confirmed the validity of the statute.
• Section 13(4) of the Public Service Act 1999 (Cth) cannot ground a defence to tortious liability. It requires compliance with valid and applicable laws only and does not authorise tortious conduct.
• The Commonwealth accepted vicarious liability, meaning the financial burden falls on the Commonwealth rather than the individual officer. The question of direct Commonwealth liability (as opposed to vicarious liability) was expressly left undetermined.
• The Court noted the Commonwealth could not identify a principled basis for confining the proposed defence to false imprisonment, to Commonwealth officers, or to reliance on High Court (as opposed to other Ch III court) authority — practitioners should note the breadth of the rejection.
• Any amelioration of the consequences of administering invalid legislation must come from Parliament, not from common law development. Practitioners advising government should be alert to the possibility of legislative reform.
• US and Canadian qualified immunity doctrines have been definitively rejected as inapplicable in Australia, foreclosing future arguments based on comparative law in this area.

• [[2023] HCA 37]
• [[1997] HCA 34]
• [[1997] HCA 25]
• [[1991] HCA 2]