•
•
•
•
chemical pollutants – Australia, Palestine, the Philippines;
oil spills – the Philippines;
energy efficiency – New Zealand; and
the application and use of genetically engineered technology – India.
Are international treaties and customary international law
recognised as a source of law by APF Member States?
The domestic application of international treaties and customary international law is dealt with
differently throughout the Asia Pacific region. Some states accept treaties and customary
international law as directly binding in their domestic arenas. Other states require international
treaties and customary international law to be incorporated in domestic legislation before they
are binding at the domestic level. Amongst these states, international treaties and customary
international law that have not been incorporated into domestic law may be accorded different
status: for example, they may or may not have persuasive force before domestic courts.
In Australia,123 Malaysia124 and Thailand,125 treaties and customary international law are not
automatically incorporated into domestic law and are enforceable only when they are
incorporated into domestic legislation. In Thailand, treaties may also be implemented
domestically, if they are approved by the National Assembly. Unincorporated treaties and
customary international law may influence the interpretation of Australian law. 126
By contrast, the Philippines sits at the other end of the spectrum. Customary international law,
general principles of international law, and international jurisprudence are sources of law, and
are incorporated into domestic law via the Constitution.127 This would also appear to be the case
in Afghanistan, where the Constitution provides that the state shall abide by Afghanistan’s
international law obligations – ‘the UN Charter, international treaties, international conventions
that Afghanistan has signed, and the Universal Declaration of Human Rights’. 128
Between these two positions sit New Zealand, India, the Republic of Korea and Afghanistan.
New Zealand has a similar approach to Australia and Malaysia, except that, apart from holding
persuasive value, customary international law may be applied directly by courts. 129 So too does
India, where the Supreme Court has held that an accepted customary law principle can be
accepted as part of domestic law.
Conversely, in the Republic of Korea, international law is subordinate to the Constitution, but
has the same status as domestic law. International customary law, however, has not been used
as a basis for a judicial decision, and the Constitutional Court has denied the use of customary
international law in certain circumstances (e.g., as a basis for reparation claims).
123
Asia Pacific Forum, above n 4, p. 94.
Ibid 123.
125
Ibid 176. See also Thai Constitution 2007 (informal English translation) arts 186.
126
Ibid 94.
127
Ibid 157.
128
Constitution of Afghanistan 1382 art 7.
129
Asia Pacific Forum, above n 4, p. 137.
124
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