The Status of the Best Evidence Rule: An Approach within the Legal Systems of Iran and the United States

Abstract

The present study examines the status of the Best Evidence Rule within the legal systems of Iran and the United States using a descriptive-comparative approach. It should be noted that different legal systems have established various rules governing evidence in order to ensure the discovery of truth and the administration of justice. One of the most important of these rules in the common law system is the Best Evidence Rule, which emphasizes the necessity of presenting the most authentic and reliable available evidence to prove the contents of a writing, document, or data record. This rule was developed to prevent distortion of facts, reduce the likelihood of forgery and error, and enhance judicial confidence in the contents of documents. Today, it occupies a prominent position in the law of evidence, particularly in the United States legal system. In contrast, although Iranian law does not recognize an independent doctrine specifically referred to as the Best Evidence Rule, many provisions concerning official and ordinary documents, the requirement to present original documents, rules governing denial, doubt, and allegations of forgery, as well as regulations related to electronic evidence, reflect an implicit acceptance of the underlying principles and objectives of this rule within the Iranian legal system. The present research employs a descriptive-analytical method and a comparative approach to examine the status, foundations, scope, and implications of the Best Evidence Rule in the legal systems of the United States and Iran. The findings indicate that U.S. law, through the codification of independent and coherent provisions within the framework of the Federal Rules of Evidence, has established a clear structure for the application of this rule. In contrast, Iranian law pursues similar objectives through a collection of dispersed legal provisions. Furthermore, developments in modern information technologies and the widespread use of electronic documents have shifted the traditional concept of the Best Evidence Rule from an emphasis on the physical original document toward contemporary criteria such as authenticity, integrity, and the reliability of data. Accordingly, it appears that the adoption of independent regulations in Iranian law, inspired by the experiences of advanced legal systems, could enhance the coherence, transparency, and efficiency of the law of evidence.