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19 ILSA Quart. 16 (2010-2011)
Grotian Moment Concept, The

handle is hein.jessup/ilsaqrtly0019 and id is 190 raw text is: The Grotian Moment Concept
by Michael P Scharf'

T      his article examines the concept of
Grotian Moment, a term that denotes
a paradigm-shifting development in which
new rules and doctrines of customary
international law emerge with unusual rapidity
and acceptance. Under the traditional approach
to determining whether an emerging norm has
ripened into a binding rule of customary interna-

tional law, courts and commen-
tators examined two factors: (1)
widespread state practice; and
(2) manifestations of opinio juris
(states' acceptance of the norm
out of a sense of obligation). The
Grolian Moment concept sug-
gests the significance of a third
factor: the context in which the
rule arises. It thereby explains
how customary international law
can sometimes be created with
scant evidence of state practice
in times of fundamental change
in the international system.

der rule, was applied by the Nuremberg Tribunal
and the Control Council Law No. 10 Tribunals
that tried Nazi war criminals after World War II,
and has since been applied by the Yugoslavia
Tribunal, Rwanda Tribunal, and Special Court for
Sierra Leone. The attorneys for the Khmer Rouge
Defendants argued that the judgments of the
Nuremberg Tribunal and its Control Council Law

No. 10 progeny provided too
scant a samping to constitute
a periods of extraordinary chane'the widespread state prac-
whether by technological advances,  tice and opinto juris required
the commission o new forms of  to establish JCE as a custom-
crimes against humanity, or the  ary international norm as of
development of new means of  1975, and that the Cambodia
warfare orterrorism, a concept that  Tribunal could not rely on the
rationalizes accelerated formation of jurisprudence of the modern
customary rules is required it  international tribunals because
international law isto keep pace  they were created after the
with such developments.   commission of the crimes in
question. In response, the brief
that I drafted maintained that
Nuremberg constituted a Gro-

During a sabbatical in the fall of 2008, I had the
unique experience of serving as Special Assis-
tant to the International Prosecutor of the Ex-
traordinary Chambers in the Courts of Cambodia
(ECCC), the tribunal created by the United Na-
tions and government of Cambodia to prosecute
the former leaders of the Khmer Rouge for the
atrocities committed during their reign of terror
(1975- 1979)2 While in Phnom Penh, I was as-
signed to prepare a first draft of the Prosecutor's
Brief3 in reply to the Defense Motion to Exclude
Joint Criminal Enterprise (JCE) as a mode of li-
ability from the trial of the five surviving leaders
of the Khmer Rouge. The JCE doctrine, which is
somewhat similar to the American felony mur-

tian Moment- an instance in which there is
such a fundamental change to the international
system that a new principle of customary inter-
national law can arise with exceptional velocity.
This was the first time in history that the term
Grotian Moment was used in a proceeding
before an international court. Yet, the concept
has potentially broad application. This article be-
gins with a history of the concept of Grotian
Moment, while comparing and contrasting the
concept with the notion of instant customary
international law. It then explores application of
the Grotian Moment concept to several areas
of emerging customary international law.

ISA 0uariterly ) volume 19   issue 3 a February 2011

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