- Monism and dualism in international law
Monists assume that the internal and international legal systems form a unity. Both national legal rules and international rules that a state has accepted, for example by way of a treaty, determine whether actions are legal or illegal.  In most monist states, a distinction between international law in the form of treaties, and other international law, e.g. jus cogens is made. International law does not need to be translated into national law. The act of ratifying the international law immediately incorporates the law into national law. International law can be directly applied by a national judge, and can be directly invoked by citizens, just as if it were national law. A judge can declare a national rule invalid if it contradicts international rules because, in some states, the latter have priority. In other states, like in Germany, treaties have the same effect as legislation, and by the principle of lex posterior, only take precedence over national legislation enacted prior to their ratification. In its most pure form, monism dictates that national law that contradicts international law is null and void, even if it predates international law, and even if it is the constitution. From a human rights point of view, for example, this has some advantages. Suppose a country has accepted a human rights treaty - the International Covenant on Civil and Political Rights for instance - but some of its national laws limit the freedom of the press. A citizen of that country, who is being prosecuted by his state for violating this national law, can invoke the human rights treaty in a national courtroom and can ask the judge to apply this treaty and to decide that the national law is invalid. He or she does not have to wait for national law that translates international law. His or her government can, after all, be negligent or even unwilling to translate. The treaty was perhaps only accepted for political reasons, in order to please donor-countries for example.
"So when someone in Holland feels his human rights are being violated he can go to a Dutch judge and the judge must apply the law of the Convention. He must apply international law even if it is not in conformity with Dutch law".
Dualists emphasize the difference between national and international law, and require the translation of the latter into the former. Without this translation, international law does not exist as law. International law has to be national law as well, or it is no law at all. If a state accepts a treaty but does not adapt its national law in order to conform to the treaty or does not create a national law explicitly incorporating the treaty, then it violates international law. But one cannot claim that the treaty has become part of national law. Citizens cannot rely on it and judges cannot apply it. National laws that contradict it remain in force. According to dualists, national judges never apply international law, only international law that has been translated into national law.
"International law as such can confer no rights cognisable in the municipal courts. It is only insofar as the rules of international law are recognized as included in the rules of municipal law that they are allowed in municipal courts to give rise to rights and obligations".
The supremacy of international law is a rule in dualist systems as it is in monist systems. Judge Sir Hersch Lauterpacht pointed out the Court's determination to discourage the evasion of international obligations, and its repeated affirmation of:the self-evident principle of international law that a State cannot invoke its municipal law as the reason for the non-fulfillment of its international obligations.
If international law is not directly applicable, as is the case in dualist systems, then it must be translated into national law, and existing national law that contradicts international law must be "translated away". It must be modified or eliminated in order to conform to international law.
Again, from a human rights point of view, if a human rights treaty is accepted for purely political reasons, and states do not intend to fully translate it into national law or to take a monist view on international law, then the implementation of the treaty is very uncertain.
In some countries, such as the UK for instance, the dualist view is predominant. International law is only part of British national law once it is accepted in national law. A treaty
"has no effect in municipal law until an Act of Parliament is passed to give effect to it. In other countries this distinction tends to be blurred. In the vast majority of democratic countries outside the Commonwealth, the legislature, or part of the legislature, participates in the process of ratification, so that ratification becomes a legislative act, and the treaty becomes effective in international law and in municipal law simultaneously. For instance, the Constitution of the United States provides that the President 'shall have power, by and with the advice and consent of the Senate, to make treaties, provided two-thirds of the Senators present concur'. Treaties ratified in accordance with the Constitution automatically become part of the municipal law of the USA".
A matter of national legal tradition
International law does not determine which point of view is to be preferred, monism or dualism. Every state decides for itself, according to its legal traditions. International law only requires that its rules are respected, and states are free to decide on the manner in which they want to respect these rules and make them binding on its citizens and agencies.
“[T]he transformation of international norms into domestic law is not necessary from the point of view of international law…the necessity of transformation is a question of national, not of international law”.
Both a monist state and a dualist state can comply with international law. All one can say is that a monist state is less at risk of violating international rules, because its judges can apply international law directly. Negligence or unwillingness to translate international law, or delays of translation, or misinterpretation of international law in national law can only pose a problem in dualist states. States are free to choose the way in which they want to respect international law, but they are always accountable if they fail to adapt their national legal system in a way that they can respect international law. Either they adopt a constitution that implements a monist system so that international law can be applied directly and without transformation, or they do not. But then they have to translate all international law in national law. In a monist state we rely only on the judges and not on the legislators, but judges can also be negligent and they can also make mistakes. If a judge in a monist states makes mistakes when applying international law, then the country violates international law just as much as a dualist country that, for one reason or another, does not allow its judges to apply international law directly and fails to translate or fails to translate correctly and effectively. One reason for preferring dualism is precisely the fear that national judges are not familiar with international law - a highly complex field of law - and hence are liable to make mistakes.
The problem of “lex posterior”
In dualist systems, international law must be translated into national law, and existing national law that contradicts international law must be "translated away". It must be modified or eliminated in order to conform to international law. However, the need for translation in dualist system causes a problem with regard to national laws voted after the act of translation. In a monist system, a national law that is voted after an international law has been accepted and that contradicts the international law, becomes automatically null and void at the moment it is voted. The international rule continues to prevail. In a dualist system, however, the original international law has been translated into national law - if all went well - but this national law can then be overridden by another national law on the principle of "lex posterior derogat legi priori", the later law replaces the earlier one. This means that the country - willingly or unwillingly - violates international law. A dualist system requires continuous screening of all subsequent national law for possible incompatibility with earlier international law.
- ^ Pieter Kooijmans, Internationaal publiekrecht in vogelvlucht, Wolters-Noordhoff, Groningen, 1994, p. 82.
- ^ G.J. Wiarda, in Antonio Cassese, International Law in a Divided World, Clarendon Press, Oxford, 1992, p. 17.
- ^ James Atkin, Baron Atkin, in M. Akehurst, Modern Introduction to International Law, Harper Collins, London, p. 45.
- ^ See The Development of International Law by the International Court, Hersch Lauterpacht (ed), Cambridge University Press, 1982, ISBN 0521463327, page 262
- ^ A. Cassese, op. cit., p. 15.
- ^ M. Akehurst, op. cit., p. 45.
- ^ A. Cassese, op. cit., p. 21-22.
- ^ P. Kooijmans, op. cit., p. 83.
- ^ ibidem, p. 83.
- ^ ibidem, p. 84.
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