Custom includes all the
norms of general international law that bind all States of the international
community. An international custom describes
a constant and unchanging behavior hold by States: States repeat and follow a customary
behavior because they are convinced of its necessity. Therefore, two main
elements characterize custom:
1) Diuturnitas:
It is the constant repetition of a specific behavior through time by a
significant number of actors.
2) Opinio
juris sive necessitatis: It is the idea that a
specific behavior is juridical mandatory or that it is necessary that it will
be so.
As
for the time for custom to consolidate, it will be shorter the more widespread
the customary behavior amongst the international community is. Indeed, at least
four sources produce customary law:
1) The
outer acts of States: a) treaties;
b) diplomatic notes; c) several behaviors within international organizations.
2)The
inner acts of States: a) laws; b)
sentences; c) administrative acts.
3)The
internal jurisprudence.
4)The
jurisprudence of international supreme
courts.
Custom creates new general international law that
binds all States, whether they did or did not participate to the birth of it. However,
there are States that may deny the applicability of a custom that they did not contribute
to create. The dispute may repeatedly originate 1) by a single State that will hence bear the name of “persistent
objector”, but it is irrelevant and equally binding the objector State, or 2)
by a group of States, and in this case
it is difficult to ignore, although if the majority of States does not consider
a behavior as binding then in fact it cannot be considered a custom at all.
Alongside with international custom, smaller and more specific
customs exist that bind a small circle of States (regional or local customs). Special
customs may link geographically neighboring or close States, contracting parts
of a treaty, contracting parts of a bilateral agreement, etc.
During the past years, the international community has
increasingly felt the need to codify
custom. The codification of custom (that is the codification of general
international law) was primarily promoted by special codification conventions
of the United Nations. The origin of the codification of customary general international
law dates back to the end of the nineteenth century. For instance, the two
Hague Conventions of 1899 and 1907 attempted to codify the international law of
war. Afterwards, from 1919 onwards, the League of Nations tried to codify
several aspects of international law, although without a great success. Things changed
with the birth of the United Nations in 1945. Art 13 of the UN Charter provides
that the UN General Assembly can undertake studies and propose recommendations
in order to encourage the progressive development of international law and its codification.
Indeed, a 1947 General Assembly Resolution established a subsidiary body named International
Law Commission (ILC). Located in Geneva, the ILC has the task to prepare
codification texts for customary norms on several subjects. Generally, it
arranges in advance the codification projects discussed in subsequent
international multilateral conventions. It often happens that the UN General
Assembly or other solemn conference of States adopt these projects, opening
them to the ratification by States. The ILC predisposed many conventions of
codifications, the majority of which have been ratified by a great number of
States. Some of the main ILC conventions are the following:
1) The
Vienna Convention on Diplomatic Relations (1961);
2) The Vienna Convention on
Consular Relations (1963);
3) The New York Convention
on Special Missions (1969);
4) The four Geneva
Conventions on the Law of the Sea (1958);
5) The Vienna Convention on
the Law of Treaties (1969);
6) The Vienna Convention on
the Law of Treaties between States and International Organizations or between
International Organizations (1986);
7) The Vienna Convention on
Succession of States in Respect of Treaties (1978);
8)The Vienna Convention on
Succession of States in Respect of State Property, Archives and Debts (1983);
9)The New York Convention
on the Law of the Non-Navigational Uses of International Watercourses (1997);
10)The New York Convention
on Jurisdictional Immunities of States and Their Property (2004);
11) The
Montego Bay Convention on the Law of the Sea (1982).
Besides the ILC, the UN General Assembly summoned some
other special conferences of States to codify customary law: think of the
Conference of Rome that in 1998 approved the Statute of the International
Criminal Court.
As known, the codification agreements, alike all other
international agreements, only bind the contracting parts and thus apply just
to States that ratify them. All UN agreements are stipulated for an endless period
and only few of them contemplate revision procedures for their norms (e.g. the
Geneva Conventions of 1958).
Finally, private codifications of international law
exist, like those promoted by the Institut
de Droit International (IDI) located in Geneva, which adopts codification
projects once approved by its plenary assembly.
References:
A. Cassese, International
Law, USA, Oxford University Press, 2001.
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