In criminal proceedings before international tribunals, expert evidence is particularly important for the efficient and effective prosecution of perpetrators of crimes under international law. Expert testimonies, a source of specialized knowledge, represent a significant portion of the evidence collected. The case law of international criminal tribunals confirms that expert testimonies are indispensable for establishing the truth and conducting fair criminal proceedings. Experts are appointed from diverse and broad fields, often specializing in unusual areas of expertise not typically used in criminal proceedings before national courts. This study presents the case law of ad hoc International Criminal Tribunals and the International Criminal Court regarding expert evidence, in particular, decisions defining the procedural standing of an expert and the scope of their opinion. Judicature regarding the evidentiary value of findings contained in expert testimonies prepared for international criminal proceedings will also be presented.
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