the appeal
13 It will be convenient at this point to set out s 22, omitting the provisions not presently relevant:
…
(2)The Attorney-General shall, as soon as is reasonably practicable, having regard to the circumstances, after a person becomes an eligible person, determine whether the person is to be surrendered in relation to a qualifying extradition offence or qualifying extradition offences.
(3)For the purposes of subsection (2), the eligible person is only to be surrendered in relation to a qualifying extradition offence if:
(a) the Attorney-General is satisfied that there is no extradition objection in relation to the offence;
(b) the Attorney-General is satisfied that, on surrender to the extradition country, the person will not be subjected to torture;
(c) where the offence is punishable by a penalty of death - by virtue of an undertaking given by the extradition country to Australia, one of the following is applicable:
(i) the person will not be tried for the offence;
(ii) if the person is tried for the offence, the death penalty will not be imposed on the person;
(iii) if the death penalty is imposed on the person, it will not be carried out;
(d) the extradition country concerned has given a speciality assurance in relation to the person;
(e) where, because of section 11, this Act applies in relation to the extradition country subject to a limitation, condition, qualification or exception that has the effect that:
(i) surrender of the person in relation to the offence shall be refused; or
(ii) surrender of the person in relation to the offence may be refused;
in certain circumstances - the Attorney-General is satisfied:
(iii) where subparagraph (i) applies - that the circumstances do not exist; or
(iv) where subparagraph (ii) applies - either that the circumstances do not exist or that they do exist but that nevertheless surrender of the person in relation to the offence should not be refused; and
(f) the Attorney-General, in his or her discretion, considers that the person should be surrendered in relation to the offence.
(4) For the purposes of paragraph (3) (d), the extradition country shall be taken to have given a speciality assurance in relation to the eligible person if, by virtue of:
(a) a provision of the law of the country;
(b) a provision of an extradition treaty in relation to the country; or
(c) an undertaking given by the country to Australia;
the eligible person, after being surrendered to the country, will not, unless the eligible person has left or had the opportunity of leaving the country:
(d) be detained or tried in the country for any offence that is alleged to have been committed, or was committed, before the eligible person's surrender other than:
(i) any surrender offence;
…
(e) be detained in the country for the purpose of being surrendered to another country for trial or punishment for any offence that is alleged to have been committed, or was committed, before the eligible person's surrender to the first-mentioned country, other than any offence in respect of which the Attorney-General consents to the eligible person being so detained and surrendered.
(5)Where the Attorney-General determines under subsection (2) that the eligible person is not to be surrendered to the extradition country in relation to any qualifying extradition offence, the Attorney-General shall order, in writing, the release of the person.
14 Senior counsel for the appellant did not contend that the Republic of Singapore did not presently intend to honour the assurance given to Australia, nor did he challenge the primary judge's observation about Singapore's intention to honour it. That, he said, was not the point. The assurance was not an undertaking having the characteristics required by s 22(3)(c) since, for various reasons, it was not enforceable under Singapore law. It was put that the Government of Singapore had no power to offer such an undertaking and could not, in any event, bind itself or the President of Singapore to grant a reprieve or a respite of execution. The effect of the assurance given was, in substance, no more than a promise to pardon by following the procedure provided for by Article 22P(2) of the Constitution of Singapore and, in any case, that procedure was not, or might not be, compatible with the assurance given.
15 Counsel argued that there was a substantial difference between an undertaking that a person will not be executed and an undertaking "by virtue of which" a person will not be executed. The choice of the latter expression pointed to an undertaking that will in fact be effective to prevent the penalty of death from being carried out, by reason of its legal effect.
16 Counsel also argued that the authorities did not support the proposition that the courts should not trespass into this area by examining foreign law and the validity of the acts of foreign governments. It was submitted that while legislation should be construed in conformity with the principles of international comity, this was so only to the extent that the language of the statute permitted, and that it was proper for a court in one jurisdiction to look at the effectiveness of an undertaking or assurance given by the government of another jurisdiction in determining whether a prerequisite to the exercise of the surrender power by the Minister under domestic law had been satisfied.
17 The learned Solicitor-General, appearing for the respondent, argued that there were three possible meanings of the expression "by virtue of" in s 22(3)(c), namely a document that is legally enforceable, a document that will in fact be honoured, and a document that complies with the statutory terms. He argued for the third of these meanings. The statutory terms, he said, did not require an undertaking that was enforceable.