Behrooz asserted the last of these rights. Neither Sleiman nor Hamzy do. They assert the penultimate right. That right may be - as has been found in Canada - vindicated by habeas corpus . However, in: Bennett v Superintendent, Rimutaka Prison [2002] 1 NZLR 616, the New Zealand Court of Appeal concluded that habeas corpus was not available to release prisoners from maximum security or non-voluntary segregation in an isolation cell where they were subject to a sentence lawfully imposed but, in relation to one of the prisoners, the Court indicated that, if he "had sought judicial review instead of restricting himself to habeas corpus we would have ordered that his cell confinement should cease immediately". The Court was of the view that "a change to the conditions on which an inmate is being detained either by segregation, reclassification or transfer to another institution does not create a new detention for the purposes" of the writ of habeas corpus: ibid at 633. Miller was distinguished on the ground that in Canada, as distinct from New Zealand, other forms of prerogative or injunctive relief were not available, necessitating an extension of the traditional application of habeas corpus : ibid at 634-5. The Court of Appeal declined to follow Miller "primarily because it is unnecessary to do so".
51 Although much has been made of the significance of the scope of the writ of habeas corpus, it seems to me that the crucial questions are the underlying issues of whether the detention is unlawful and, of course, if unlawful, in what sense is it unlawful. Analysis of the applicability of the writ is, no doubt, illuminating but, as Bennett shows, is affected by procedural and policy considerations that are not, or not clearly, material to determining whether detention is unlawful and whether the character and effect of that unlawfulness give rise to such an unjustified restriction of a prisoners residual liberty as to attract, if not habeas corpus, the grant of injunctive relief requiring the prisoner's release from the place of his unlawful detention.
52 The significance of Miller and of the approval of that approach in Prisoners A-XX, lies as it seems to me, in the use in the former and the endorsement in the latter of the significance of the concepts of residual freedom and prison within a prison for the analysis of the character of unlawful detention in the prison context and the rejection of the alternative view, arising from a simpler age, that liberty is all or nothing. In one sense, of course, this is true: the tort of false imprisonment will lie where only part of one's liberty is unlawfully restricted. The Miller approach recognizes the real and legal existence of the obverse: that a person whose freedom is partially and legally restricted is left with a residue of freedom that will be protected one way or another, where it is unlawfully restricted in a prison within a prison by habeas corpus in Canada and, perhaps, New South Wales and by injunction in New Zealand. The question here is whether the legal existence of that freedom is arguably sufficient to constitute the tort of false imprisonment. Even if, for the reasons stated in Bennett, the writ will not issue, I do not think it follows the unlawful detention cannot give rise to the tort of false imprisonment. As suggested above, the assumption that the notion of liberty protected by the writ is necessarily identical with that vindicated by the tort may not be correct. It seems to me at least arguable that an unlawful detention that can be ordered to cease may well be detention that constitutes the tort.
53 In Canada, the reasoning in Miller has been followed and extended in May & Ors v The Warden of Ferndale Institution and Others, a number of prisoners serving life sentences were involuntarily transferred from the Ferndale Institution, a minimum security institution to medium security gaol, which involved a significant deprivation of liberty for inmates. The prisoners sought, amongst things, relief by way of habeas corpus directing the responsible official to transfer them back to the Ferndale Institution. The prisoners contended that the transfers were arbitrary, and were made without considering the merits of each case and in breach of the rules of procedural fairness. The majority held that the law in Canada, resting in part on Miller, established the fundamental principle that habeas corpus will lie to determine the validity of the confinement of an inmate's administrative segregation and, if such confinement is found unlawful, to effect release into the general inmate population of the gaol. As the majority point out (at [74]) two conditions must be satisfied before a writ will be issued: first, a deprivation of liberty; and second, that the deprivation be unlawful. The majority held ([76]) that the decision to transfer an inmate to a more restrictive institutional setting constituted a deprivation of his or her residual liberty and, accordingly, the first condition was satisfied. The decision to transfer the prisoners was, of course, an administrative decision. Such decisions must also be made in accordance with the common law duty of procedural fairness and requisite statutory duties ([77]). The majority rejected the prisoners' contention that the decision to transfer them was arbitrary. However, they held that non-disclosure of certain relevant scoring mechanisms used to assess the desirability of transfers "constituted a major breach of the duty to disclose inherent in the requirement of procedural fairness" ([117]). They concluded that, in concealing "crucial information" the authorities "violated their statutory duty" with the consequence that the "transfer decisions were made improperly and, therefore, they are null and void for want of jurisdiction … [and it] follows that the [prisoners] were unlawfully deprived of their liberty" ([120]). The Court therefore ordered that the prisoners who were still incarcerated in a medium security institution pursuant to the impugned decision to be returned to a minimum security institution. The minority dissented on the ground that there was no material non-disclosure and hence no procedural unfairness. They did not suggest that the statements of principle contained in the majority judgment were mistaken as to the propriety and significance of the notion of residual liberty in the context of unlawful placement of a prisoner.
54 This decision, I think, provides significant support for Mr Robinson's submission that the necessary elements of an action for false imprisonment are present when a prisoner is unlawfully transferred to a prison within a prison. He argues that the HRMU is precisely such a prison and placing Sleiman in the HRMU for the purpose of unlawful segregation is itself unlawful. As I understand him, Mr Kirk argues that the unlawfulness of the segregation and the place where it occurs are but accidentally linked, so that the fact that Sleiman was held in the HRMU is immaterial to considering whether his imprisonment is unlawful. I find this argument difficult to accept. It was not accepted by the Canadian Supreme Court in Miller where the Court concluded, albeit in the context of the requirements for the issue of a writ of habeas corpus, that the unlawful transfer to the special handling unit was an unlawful deprivation of liberty, (see the passage cited above in [34]) and it was implicitly rejected (albeit in obiter dicta) in Prisoners A-XX. Where the very purpose of Sleiman's incarceration in the HRMU was to effect his segregation, acceptance of Mr Kirk's argument would be to engage in fiction. When dealing with the civil rights of the subject, fictions are best avoided.
55 In Soh v The Commonwealth, Mr Soh was an unlawful non-citizen who was detained in an immigration centre but, following an incident, was transferred to a New South Wales State prison where he was held for about nine months before being returned to the detention centre. He was not the subject of any criminal charge nor under any sentence imposed by a court. Madgwick J held that the Migration Act 1958 (Cth) authorised the detention of an unlawful non-citizen on the prison which was not rendered unlawful by denying him, for a short time, procedural fairness. In doing so, his Honour pointed out that he had assumed, rather than decided, that "illegal imprisonment of one kind when, in any case, the applicant would be liable to imprisonment (detention) of another should be held to be within the tort of false imprisonment" and adding, "it strikes me, as the probably preferable route for development of the common law", citing amongst other cases, Prisoners A-XX, Hague and Miller.
56 Although it might be a "development" of the common law to hold that Sleiman and Hamzy can, if the allegations in their proposed statement of claim are made out, maintain an action for false imprisonment, this is only true in the sense that such an action has not yet been undertaken and there is, as yet, no decision in the courts of this country on the question. This is not to say that the common law must change to accommodate such an action. But, at all events, that such a "development" might be necessary before the proposed action is maintainable cannot, I think, be regarded as an insuperable barrier.
57 Mr Kirk submits that, to permit an action for false imprisonment in the present circumstances would be to introduce incoherence into the law. I am sceptical that the notion is relevant to the law of trespass. For example, the discussion in Graham Barclay Oysters Pty Ltd v Ryan (2002) 211 CLR 540, at 596-597 (per Gummow and Hayne JJ), cited by Spigelman CJ in Hunter Area Health Service & Anor v Presland [2005] NSWCA 33 at [20] ff; (2005) 63 NSWLR 22 at 29) concerned the question of whether a public authority owed a duty of care to the putative plaintiff for the purpose of an action in negligence; see also Precision Products (NSW) Pty Limited v Hawkesbury City Council [2008] NSWCA 278. There can be no doubt that the prison authorities have a duty of care to prisoners. Here there is no question of "positing a duty to exercise reasonable care not to make a flawed decision" (per Allsop P, Precision Products at [120]): the exercise of reasonable care is immaterial to the commission of the tort and it is not a defence where a prisoner is kept in prison after his term has expired:
58 At all events, the crucial question here is whether Sleiman was unlawfully detained in the HRMU. Whether detention is unlawful in any particular case cannot depend on policy considerations, though it might of course depend on statutory interpretation. If his detention were unlawful, certainly a declaration to that effect would be made, unless there were present some (unlikely) grounds for refusing it in the exercise of the discretion. I am unable to see how questions of coherence arise for consideration in determining whether Sleiman's detention in the HRMU was unlawful or the ensuing issue whether that detention, being unlawful, amounted to a trespass.