29 There is, in my opinion, yet a further reason why the "sentence" referred to in s 23 must be a reference to the total sentence and not to the non-parole period. The only authority in the CSP Act for setting a non-parole period which is less than the total sentence is s 44 which is in Division 1 of Part 1 of the Act; but s 54 expressly provides that the Division does not apply to the sentencing of an offender to detention under the MHCP Act. A corresponding provision was formerly to be found in s 13(d) of the Sentencing Act, but it only provided that the relevant Part of the Act did not apply to detention under ss 25 or 39 of the MHCP Act, which relate to detention following a verdict of not guilty on the ground of mental illness. The broader exclusion in the CSP Act is, in my view, significant and must have been intended to refer to all detention under the MHCP Act, including detention under ss 23, 24 and 27. Consequently, simply as a matter of construction, there is no statutory authority in the case of a limiting term for fixing a non-parole or equivalent period at less than the total term.
30 It was submitted that this approach gave rise to an anomaly in the case of persons sentenced to terms of imprisonment for not more than 3 years because in those cases the sentencing court is required to make an order for their release on parole: s 50, and so limiting terms of not more than 3 years would need to have a non-parole period fixed so that s 50 could be complied with. However, s 50 is also in Division 1 of Part 4 and consequently does not apply in the case of limiting terms. Not only is there no authority to fix a non-parole period, but in the case of limiting terms of not more than 3 years, there is no authority for the sentencing court to order earlier release on parole during that period.
31 Incidentally, although not relevant to this case, similar considerations would apply to the new s 44 inserted by the 2002 amendments and applicable to offences committed after 1 February 2003. The section now talks of a "non-parole period for the sentence": sub-s (1) and the "balance of the term of the sentence": sub-s (2). What was s 51 has now become s 54D, and, so far as is relevant, is in the same terms.
32 The objects of sentencing a person who has been convicted of a crime following a trial are the punishment of such person and the other objects set out in s 3A of the CSP Act. The object of nominating a limiting term is not to punish the person who has not been convicted of any crime, but to ensure that he or she is not detained in custody longer than the maximum the person could have been detained if so convicted following a proper trial, although such person may be released prior to the expiration of such limiting term depending on the person's condition, or if such person becomes fit to be tried during such term, he or she can be tried according to law and if found guilty at such trial, can have a proper sentence fixed with a non-parole period. The maximum time that a person can be detained if convicted at a proper trial is the head or total sentence not the non-parole period: MHCP Act s 28 which sentence must take into account any time served under a limiting term.
33 When the appeal was called on for hearing, Mr Dalton, who appeared for the applicant, said that he had indirectly received some information which suggested that one of the factual propositions on which the reasoning in Mitchell was based, namely that persons serving limiting terms were subject to regular reviews by the Mental Health Review Tribunal and could in appropriate cases be released, conditionally or otherwise, pursuant to s 84 prior to the expiration of such limiting terms, was incorrect, and that there was an executive policy that such persons were not to be released prior to such expiration.
34 He therefore sought an adjournment to obtain relevant evidence on this point. The Court refused the adjournment but granted him and the Crown leave to obtain further evidence on the issue and make further written submissions thereon. The Legal Aid Commission, on behalf of the applicant, and the Director of Public Prosecutions both wrote to the Mental Health Review Tribunal which provided a single reply to both requests; and this correspondence together with both sets of further Written Submissions have now been received.
35 In reply to the question whether there is a policy regarding conditional release of persons serving limiting terms, the Tribunal acknowledged its jurisdiction under ss 80(1)(b) and 82 of the Mental Health Act and stated it did not have a policy on the release of such persons prior to the expiration of such terms. It pointed out that generally persons serving limiting terms have an intellectual disability (such as the applicant) and not a mental illness, and usually such persons are detained in the correctional system, subject to the same security classifications as other inmates but, because they do not have non-parole periods, they are not eligible for early release. On the other hand, persons who have a mental illness may spend part or all of their limiting term in hospital receiving treatment for their mental illness, and up to 6 months prior to the expiration of their limiting term they may be classified as a "continued treatment patient" under s 89 of the Act which leads to the cessation of their forensic status and their continued confinement as a compulsory treatment patient under s 57.
36 The Tribunal advised that it was particularly difficult for persons with intellectual disability serving limiting terms to obtain conditional early release because such applications are seldom made on their behalf and there is a severe lack of support services in the community to manage such persons post release. It was therefore unlikely the Tribunal would be able to satisfy itself on the question of management of risk to the patient or the community. The Tribunal also advised that there is in fact no one currently under its jurisdiction, serving a limiting term who has been released prior to the expiry of their limiting term. In response to a similar enquiry, the Attorney General replied that in determining whether to object to the release of a limiting term forensic patient, he would consider each case on its merits by reference to the grounds specified in s 84(1) of the Mental Health Act.
37 The responses of the Tribunal and of the Attorney General indicate that there is no official executive policy to ensure that persons subject to limiting terms are not released conditionally or unconditionally prior to the expiration of the limiting terms although, in practice, such early releases are most unlikely, at least in the case of intellectually disabled inmates.
38 However, the Court's reasoning in Mitchell was based on the proper construction of the legislation and, in my view, is not affected by the material now adduced or its practical application. The effect of the statutory provisions, including the possible early release of persons subject to a limiting term remains valid and Mitchell should continue to be followed.
39 The difficulties facing intellectually disabled persons subject to limiting terms has been raised by the Tribunal and considered by, inter alia, the Law Reform Commission which, in its Discussion Paper no: 35, People with an Intellectual Disability and the Criminal Justice System: Courts and Sentencing Issues (October 1994) raised the possibility of amendment to the legislation so that the limiting term was divided into minimum and additional terms, but in its final report on the issue: Report no 80 (December 1996) expressly rejected the proposal.