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Generally, the question of whether a member acted in accordance with the agreement hinges frequently on whether and to what extent that member must demonstrate compliance or the complaint must demonstrate a lack of compliance. This is the issue of “the ultimate burden of proof for establishing a claim or a defence”. It is demonstrated that the burden of proof is a procedural concept which speaks to the fair and orderly management and disposition of a dispute.
(ⅰ) General Rules Well Established in Violation Complaints
Article 3.8 of the Understanding on Rules and Procedures Governing the Settlement of Disputes (‘DSU’) provides that in cases where there is an infringement of the obligations assumed under a covered agreement -- that is, in cases where a violation is established -- there is a presumption of nullification or impairment. However, the issue of burden of proof here is not what happens after a violation is established; the issue is which party must first show that there is, or is not, a violation. In this respect, a number of GATT 1947 panel reports contain language supporting the proposition that the burden of establishing a violation under Article XXIII:1(a) of the GATT 1947 was on the complaining party, i.e., it was for the complaining party to present a prima facie case of violation before a panel. This rule is taken on by the DSB.
With regard to the issue of burden of proof, the Appellate Body in US-Shirts and Blouses (DS33) rule that: “In addressing this issue, we find it difficult, indeed, to see how any system of judicial settlement could work if it incorporated the proposition that the mere assertion of a claim might amount to proof. It is, thus, hardly surprising that various international tribunals, including the International Court of Justice, have generally and consistently accepted and applied the rule that the party who asserts a fact, whether the claimant or the respondent, is responsible for providing proof thereof. Also, it is a generally-accepted canon of evidence in civil law, common law and, in fact, most jurisdictions, that the burden of proof rests upon the party, whether complaining or defending, who asserts the affirmative of a particular claim or defence. If that party adduces evidence sufficient to raise a presumption that what is claimed is true, the burden then shifts to the other party, who will fail unless it adduces sufficient evidence to rebut the presumption.” 2And this ruling is demonstrated to be well established in subsequent cases as a general rule concerning burden of proof.
For example, in Argentina-Leather (DS155), the Panel rule as: “The relevant rules concerning burden of proof, while not expressly provided for in the DSU, are well established in WTO jurisprudence. The general rule is set out in the Appellate Body report on United States - Measure Affecting Imports of Woven Wool Shirts and Blouses, wherein it is stated that: ‘It is a generally-accepted canon of evidence in civil law, common law and, in fact, most jurisdictions, that the burden of proof rests upon the party, whether complaining or defending, who asserts the affirmative of a particular claim or defence. If that party adduces evidence sufficient to raise a presumption that what is claimed is true, the burden then shifts to the other party, who will fail unless it adduces sufficient evidence to rebut the presumption’.” 3
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