The scope of ss8 and 16: powers in the nature of duties or discretionary powers?
24 By placing ss8(1) and 16(1) side by side, it can be seen that the power in s8(1) is enlivened if the proceedings include a claim for an extended supervision order and that the power in s16(1) is enlivened if the proceedings include a claim for a continuing detention order. Since each form of final relief was sought in the present case, it was open to the Court to grant either form of interim relief if the circumstances permitted it, as they were found to do.
25 For each provision, the power to make the respective interim order is enlivened if it "appears" to the Court that the conditions in (a) and (b) are satisfied.
26 There was never a question about condition (a) in the instant case.
27 The terms of condition (b) make it plain that the Court's function under the respective provisions is to examine the "supporting documentation" (as to which see ss6(3) and 14(3)) to determine what is "alleged" in that documentation; and to decide whether it "would, if proved, justify" the making of the stipulated final order.
28 As regards interim supervision orders, it need only appear that the matters alleged would justify the making of an extended supervision order (s8(1)(b)).
29 As regards interim detention orders, the power is enlivened if the matters would justify the making of either type of final order (s16(1)(b)). The word "or" in s16(1)(b) indicates that an interim detention order is capable of being made even if the matters alleged would only justify the making of an extended supervision order, so long as the substantive proceedings contain a claim for a continuing detention order. See also s17(1).
30 There was debate before us as to whether the subsections contain a power in the nature of a duty or a discretionary power. It had been common ground below that a true discretion was involved, and Hoeben J accepted this proposition (J15). (See also Attorney-General v Gallagher [2006] NSWSC 340 at [36] (McClellan CJ at CL)). This also was the initial position of the appellant on appeal although, responding to questions from the Bench, the appellant advanced some arguments in favour of construing the "may" as a "must".
31 The principles indicating the interpretation of the word "may" in such circumstances have recently been expounded by the High Court (Leach v R (2007) 232 ALR 325, [2007] HCA 3).
32 In our view, the powers under the respective provisions entail a discretion, enabling the Court to refuse to make an order in a proper case even if conditions (a) and (b) are satisfied. It is sufficient to explain why this is so in the context of s16(1), the presently relevant provision.
33 The joint judgment of Gummow, Hayne, Heydon and Crennan JJ in Leach recognised (at [38]) that a provision stating that a court or body "may" do something if satisfied of certain matters did not necessarily show that the court had a discretion to exercise. In some situations, for example as discussed in Finance Facilities Pty Ltd v Federal Commissioner of Taxation (1971) 127 CLR 106 and Mitchell v The Queen (1996) 184 CLR 333, the word "may" will be found to confer a power which is to be exercised upon the court being satisfied of the matters described in the provision. Leach involved such a provision.
34 The onus lies on those who assert that the word "may" has a compulsory meaning to show, as a matter of construction of the Act, taken as a whole, that the word was intended to have such a meaning (Ex parte Gleeson [1907] VLR 368 at 373 per Cussen J). The issue must be determined in the particular statutory context.
35 Pearce & Geddes, Statutory Interpretation in Australia, 6th ed, (2006), Chatswood, state (at [11.3]) that where the purpose or object of the Act would be defeated if a task were not carried out the court will rule that the provision is obligatory and the possessor of the power has no discretion to refuse to exercise it.
36 In some situations there may appear to be no reason to infer a discretion once the repository of the power is satisfied that the circumstances entitle the recipient to a favourable exercise of it (see, eg Finance Facilities (involving a taxation rebate), Bradley v Commonwealth (1973) 128 CLR 557 (involving the right to postal and telegraphic services) and Commissioner of State Revenue (Vic) v Royal Insurance Australia Ltd (1994) 182 CLR 51 (involving a refund of overpaid tax)).
37 By contrast, the present legislation is restrictive of liberty and could not be seen as an enactment for the benefit of the offender. The stated objects of the Act do not require the provisions in question to be interpreted as involving no element of discretion.
38 Mitchell involved a power to order that a prisoner was not eligible for parole if that was considered "appropriate". The power was conditional upon a balance being struck, but once this occurred there was really nothing further to weigh. By contrast, s16(1) confers a power to order interim detention by reference only to it appearing that conditions (a) and (b) were satisfied. The terms of condition (b) address the documentation supporting the claim for final relief upon the assumption that the matters alleged are proved. They do not indicate criteria that require to be fulfilled for a favourable exercise of the power to make an interim order.
39 Section 27 states that the Act does not affect the right of any party to proceedings under the Act to call witnesses and give evidence, or to cross-examine witnesses. One would have thought such a provision unnecessary as regards the making of final orders. And the powers to make interim orders are capable of exercise from time to time, obviously, in light of the situation then prevailing. Accordingly, for s27 to have effective work to do, it would appear to be directed at the situation of an offender seeking to resist the making of an interim order where otherwise paras (a) and (b) of ss8 and 16 are formally satisfied. There is no reason why, for instance, an offender could not seek to establish that the matters alleged in the supporting documentation were incapable of proof. At the very least the provision reinforces the conclusion that "may" imports a judicial discretion.
40 A further indicator that the power is not in the nature of a duty stems from the fact that, if it were a duty, ss8 and 16 would present the Court with incompatible statutory commands in a case like the present where each category of final relief is sought and where the supporting documentation discloses that either final order would be justified.
41 The Act draws certain distinctions that are, in our view, relevant to the issue at hand. The first relates to the documentary information that "must" accompany the application for a continuing detention order (see s14(3)) and that which "may" be indicated in the application (see s14(4)). The second distinction is between the "documentation" required to support the application when it is filed (s14(3)) or which must be disclosed (s15(2)), on the one hand, and the "evidence" upon which the application will ultimately be determined by the Supreme Court, on the other (see s17(4)). That "evidence" will obviously include relevant material tendered by the offender in opposition to the application. Furthermore, there is nothing to prohibit the Attorney General from supplementing the original "documentation" by proffering additional evidence, including for example, evidence arising out of the psychiatric examinations of the offender that will take place if and when ordered in accordance with the pre-trial procedure stipulated in s15(4).
42 Accordingly, a true judicial discretion is involved.