Introduction – II. General evidentiary challenges: Standard of Proof for adjudicating corruption claims before arbitral tribunals – A. Standard of Proof applied – B. Availability of evidence – C. The Gathering of Evidence: Admissibility issues – D. The Role of the Applicable Law – (i) Law applicable to defining the criteria for corruption – (ii) Law applicable to evidentiary issues – III. Enforcement Considerations – IV. Additional considerations – A. Do arbitrators have a duty to sua sponte investigate if corruption is suspected? – V. Conclusion.