The power is constrained by the conditions specified in s 6. In particular a court shall not make an order under s 4 unless it is satisfied that it is appropriate for the offender to undertake such an order.
66. The conditions and constraints upon the exercise of a power to make a periodic detention order affect the way in which a sentencing court must approach its exercise.
67. The condition that, but for the option of a periodic detention order, the court would sentence the person to a term of imprisonment means that the court must first have satisfied the requirements of s 345 of the Crimes Act. That is to say, after having considered all other available penalties, it is satisfied that no other penalty but imprisonment is appropriate in all the circumstances of the case. In order that s 345 of the Crimes Act and s 4 of the Periodic Detention Act can stand together, it seems that periodic detention is not to be regarded as one of the 'other available penalties' mentioned in s 345. That is consistent with the character of a periodic detention order as a custodial disposition, albeit under the operation of the Periodic Detention Act. The time actually served in prison will be two sevenths of the term of imprisonment that would otherwise be imposed.
68. While s 345 of the Crimes Act mandates the consideration by the sentencing court of non-custodial options before a determination of a term of imprisonment it does not mandate the prior consideration of periodic detention. The Periodic Detention Act itself does not in terms require the court to give consideration to that option. Nevertheless the legislature has provided it as an option when a term of imprisonment of between three and 24 months is contemplated. It is consistent with its availability in those circumstances that the legislature intends that it should be considered. The making of such an order however requires a positive justification. That is so because the court is not to make such an order unless it is satisfied that it is appropriate for the offender to undertake it.
69. Absent a submission made by counsel or material before the sentencing court which would arguably justify the making of such an order, it may not necessarily follow that a judge who did not expressly advert to periodic detention could be said to have erred in principle for failing to do so. But that is not this case.
70. In this case the learned magistrate expressly referred to periodic detention and impliedly to the factors, evocative of her sympathy, which were personal to the accused and which might have been relevant to the exercise of the discretion to make such an order. It is evident from her reasons that she was not persuaded that it would have been appropriate for Mr Diebert to undertake periodic detention. In so concluding, she had regard and gave great weight to general deterrence being the necessity to send a 'message' to 'other like minded members of the community'. She did so against the background of an offence which involved a large and sophisticated commercial drug production operation. In my opinion it cannot be said that she erred in the approach which she took having regard to the provisions of the Periodic Detention Act.
71. It would, no doubt, have been preferable had the learned magistrate, in dealing with the question of periodic detention, expressly referred to the relevant provisions of the Periodic Detention Act and the individual factors which led her to the conclusion that it was not an appropriate disposition. The rolled up way in which she dealt with the question may have been less than satisfactory. It did not, however, indicate error to justify appellate intervention.
72. The learned judge on appeal evidently formed the view that there should have been a more extensive consideration of the matters relevant to the issue of periodic detention. His Honour gave weight to the mental health, employment and family concerns in deciding that such an order should be made. He did not in terms advert to the requirement that such an order should not be made unless appropriate and the associated need to justify it.
73. In my opinion, and with respect to his Honour, the judgment he made was, in the end, substitutive rather than corrective of error. For this reason the appeal against his Honour's decision should be allowed.
The Disposition
74. The question which then arises is what is the appropriate disposition of the appeal in this case? Mr Diebert had served two months of the original term of imprisonment imposed by the Magistrates Court when the order for periodic detention was made. Since that time he has served the equivalent of about seven months of periodic detention.
75. The reimposition of the original term of imprisonment without credit for the time which Mr Diebert has served in periodic detention would be unfair and oppressive. The question is whether, in the circumstances, the credit for the time served should be calculated by reference to the days actually spent in custody under the periodic detention order or by reference to the number of weeks in which he has been subjected to periodic detention as though those full weeks had been served. The latter option would reflect the equivalence between periodic detention and the alternative term of imprisonment which is specified in s 4(2) of the Periodic Detention Act.
76. In this case the appellant accepts that it would be appropriate to give credit on the latter basis and requires only that he serve the balance of the term imposed by the learned magistrate after such credit has been taken into account along with the two months originally served.
77. This would be a disposition within the power of this Court under s 37O(1)(b) of the Supreme Court Act.
78. It is an appropriate disposition having regard to the Crown's acceptance of it and to the fact that Mr Diebert has continued in employment during his periodic detention and that he has continued to play an important role in the life of his son.
79. The orders on the appeal to this Court should therefore be: