Claim that lawfulness of current detention depended upon past circumstances
14 A writ of habeas corpus or an order in the nature of habeas corpus will require a person to be released from their current detention. It will speak at a particular place and time: Ruddock v Vadarlis [2001] FCA 1329; (2001) 110 FCR 491 at [71] (Black CJ). Therefore, there must be an issue with the validity of the current detention. So, in order to obtain a writ of habeas corpus an applicant must show that, at the time of hearing, he or she is being detained without lawful authority BVZ21 v Commonwealth of Australia [2021] FCA 1598 at [21] (Bromwich J).
15 A person who was once detained without authority may subsequently become detained with authority: see Guo v Commonwealth of Australia [2017] FCA 1355; (2017) 258 FCR 31 at [83] (Jagot J); Burgess v Commonwealth of Australia [2020] FCA 670; (2020) 276 FCR 548 at [68] (Jagot J); and McHugh at [270]-[271] (Mortimer J).
16 Therefore, if the lawfulness of the current detention of a person depends solely upon current circumstances then it is only those circumstances that are to be examined. It is not necessary to consider past circumstances for the purposes of habeas corpus (though past periods of unlawful detention may still give rise to a claim of false imprisonment). If the lawfulness of the current detention depends wholly or partly on past circumstances then those circumstances must be evaluated. All of which is to expose the importance of considering the nature and extent of the particular power relied upon to justify detention. Whether past actions affect the lawfulness of the current detention depends upon the nature of the authority relied upon to detain the person.
17 In the course of oral argument, counsel for the applicant articulated the case as being advanced on the basis that the power in s 189(1) 'requires a person who is holding a suspicion today to be satisfied that at the time that the applicant was first taken into detention, his detention was lawful and supported by knowledge or reasonable suspicion'. In other words, ongoing lawful detention depends upon the person having been lawfully detained at the outset.
18 The case for the applicant called in aid the terms of s 196(1) which provides that: 'An unlawful non-citizen detained under s 189 must be kept in immigration detention until [relevantly for present purposes] he or she is removed from Australia …'. It was said that s 196(1) 'links' ongoing detention back to 'the original detention under section 189(1)'.
19 In the circumstances of the present case, the detention of the applicant was to be justified by s 189(1). The period of that detention was to be determined by s 196. These matters were explained by the majority in Commonwealth of Australia v AJL20 [2021] HCA 21 at [16]-[17] (Kiefel CJ, Gageler, Keane and Steward JJ) in the following terms:
Read with the definition of 'detain' in s 5(1) of the Act, s 189(1) has two distinct and sequential operations. First, it authorises and requires a person in the migration zone to be taken into immigration detention by an officer who knows or reasonably suspects that the person is an unlawful non-citizen. Secondly, it authorises and requires the person, having been taken into immigration detention, to be kept in immigration detention by or at the direction of an officer who knows or reasonably suspects that the person is an unlawful non-citizen.
Section 196 governs the period for which a person taken into immigration detention is to be kept in immigration detention under s 189(1) by or at the direction of an officer who knows or reasonably suspects that the person is an unlawful non-citizen.
20 Significantly, s 196 does not provide a separate source of authority to detain. In particular, it does not justify ongoing detention of a person who is not detained lawfully under s 189(1). Therefore, at all times, the detention of a person under s 189(1) depends upon the existence in the mind of a relevant officer of knowledge or reasonable suspicion that the person is an unlawful citizen.
21 When s 196 refers to an unlawful non-citizen being detained under s 189(1), it is referring to the duration of the second of the sequential operations under s 189(1) as described by the majority in AJL20. The opening words in s 196 reflect that connection. However, they do not alter the nature and character of the circumstances that must exist in order for the detention to commence and continue. Those matters are specified in s 189(1). Put another way, s 196 does no more than specify the circumstances that bring to an end the duration of a lawful detention under s 189(1). This is consistent with the expression of the attendant obligation in s 198 which requires the removal of an unlawful non-citizen 'as soon as reasonably practicable'. For completeness, I note that this was not a case where issues were raised as to whether removal was practicable or whether that obligation had been performed, as to which see Thoms v Commonwealth of Australia [2022] HCA 20.
22 In Ruddock v Taylor [2005] HCA 48; (2005) 222 CLR 612, it was stated by Gleeson CJ, Gummow, Hayne and Heydon JJ at [40] that what constitutes reasonable grounds for suspecting a person to be a non-citizen for the purposes of s 189(1) 'must be judged against what was known or reasonably capable of being known at the relevant time'. The same must apply where the detention arises from knowledge on the part of the relevant officer.
23 In Thoms at [21], Kiefel CJ, Keane and Gleeson JJ referred to Ruddock v Taylor as authority for the proposition: 'What constitutes reasonable grounds for suspecting a person to be an unlawful non‑citizen is to be judged as at the time the detention was effected'. Later (at [31]), their Honours said: 'So long as the officers in question had objectively reasonable grounds to suspect that [Mr Thoms] was a non-citizen who did not hold an effective visa, that was sufficient for his detention to be justified'. What was not required to be considered was whether, under the terms of s 189(1), ongoing detention depended upon past valid detention, particularly valid commencement of detention. Nevertheless, I am inclined to the view that it does not. As explained in AJL20, s 189(1) speaks both at the time of initial detention and continuously. Therefore, irrespective of the circumstances of past detention, it requires a person to be detained if the requisite suspicion is held.
24 However, I am mindful that because s 189(1) concerns that most fundamental of freedoms, namely the liberty of the subject, the principle of legality applies to its proper construction: see Re Bolton; Ex Parte Beane (1987) 162 CLR 514; Coco v The Queen (1994) 179 CLR 427 at 437 (Mason CJ, Brennan, Gaudron and McHugh JJ); and Electrolux Home Products Pty Ltd v Australian Workers' Union [2004] HCA 40; (2004) 221 CLR 309 at [21] (Gleeson CJ) quoted with approval in Saeed v Minister for Immigration and Citizenship [2010] HCA 23; (2010) 241 CLR 252 at [15] and North Australian Aboriginal Justice Agency Limited v Northern Territory [2015] HCA 41; (2015) 256 CLR 569 at [11] (French CJ, Kiefel and Bell JJ). Also, the contention to the effect that current detention under s 189(1) depended upon the validity of past detention, particularly initial detention, only emerged in the course of oral argument. Until then the submission appeared to be that the validity of any current executive detention always depended upon the validity of past executive detention irrespective of the terms in which the executive power to detain was conferred. In those circumstances, without the benefit of fully considered argument, I prefer to express no concluded view on the point.