17 I also agree with Dowsett J in thinking that this provision in Direction No. 17 is an unlawful fetter on the generally worded discretion conferred on the Minister by s 501(2). When his Honour described the discretion conferred by s 501 as "unfettered", he must, I think, be understood as saying that it was not fettered by any express limitation. It is well-established that a statutory discretion which in its terms is unconfined must, nevertheless, be exercised by reference to considerations identified by implication from the subject matter, scope and purpose of the statute. See Minister for Aboriginal Affairs v Peko-Wallsend Ltd (1986) 162 CLR 24 at 39 - 40. The vice in the provision in question in the Direction is that it is an express fetter on the discretion conferred by s 501(2). As a matter of construction of the section, the Minister retains a discretion under s 501(2) not to cancel a visa even though the visa holder has committed an offence or offences that have attracted the severest punishment imposable. The risk to the Australian community of allowing the person to remain a member of it cannot be assessed in every case in which the power comes to be exercised to outweigh all other considerations of the particular case. It may well be difficult to envisage a case involving a person convicted of a most serious crime or a person with a long criminal history in which non-cancellation may be justified. Nevertheless, the discretion still remains. The Minister cannot lawfully prevent such an outcome from ever taking place by adopting Direction No. 17 in its present form. The importance of recognising the true nature of the power conferred by s 501 is underlined by the fact that the exercise of the discretion is not confined to persons who have demonstrated, by the circumstances in which they have been convicted or otherwise, that they are engaged in activities involving a high degree of criminal conduct. As this case demonstrates, the statutory discretion, if properly exercised, can be invoked to remove from the Australian community drug addicts who have engaged in limited and relatively low level criminal activity here. Hayne J, in Truong, Ex parte - Re Ruddock, Minister for Immigration and Multicultural Affairs M14/2001 (22 March 2001), records a statement by a spokesman for the Minister to the effect that permanent residents sentenced to jail for twelve months or more are automatically looked at for deportation. Criminal conduct ranging widely in its degree of seriousness is thus reviewed for the purpose of determining whether the power in s 501 should be exercised against the person involved. But the discretionary power must always be exercised according to law, by reference to all the relevant circumstances of the individual case. For example, the organiser of major heroin importations is engaged in a much more serious level of criminal activity than is an addict who deals only in small quantities of heroin at street level to feed her addiction. When the question is whether the power in s 501 should be exercised against the person concerned, factors favouring non-cancellation of the person's visa may count for little in the former case, but may well be entitled to much more consideration in the latter.
18 Paragraphs 2.2 and 2.17 of the Direction impose an unlawful fetter because they lay down a general rule that, in no case, can a non-primary consideration telling against cancellation of a person's visa under s 501 be given more weight than any of the three primary considerations, no matter how powerfully that non-primary consideration may favour allowing the particular person to retain the visa. It will often, though not invariably, be the case that the first two primary considerations will both tell in favour of cancellation of the visa. In all such cases, and particularly in cases where the visa holder's criminal conduct is in the lower range of seriousness (though still such as to enliven the discretion to cancel), by force of the weighting requirement of the policy a powerful other consideration strongly favouring non-cancellation will never be able to be acted on to that effect by the Minister who elects to apply the policy (or by his delegate who is bound to apply the policy). This is so even though par 2.2 of the Direction, in stating that "no individual considerations can be more important than a primary consideration", goes on to say that: