Abstract

This study contrasts the evidence exclusion principles within the adversarial legal system of the United States, particularly the “fruit of the poisonous tree” doctrine, with the inquisitorial system of Vietnam. The U.S. model, emphasizing the exclusion of unlawfully obtained evidence to protect the presumption of innocence and ensure fair trials, relies on the Fourth Amendment to prevent police misconduct. Conversely, Vietnam, with its focus on uncovering the truth, has started to adopt adversarial elements, including evidence exclusion, to align with international standards and enhance human rights protections within its criminal justice system. The research examines the application of the “fruit of the poisonous tree” doctrine in the U.S. and its implications for Vietnamese legal reforms, especially the proposed amendments to Article 87 of Vietnam's Criminal Procedure Code. These reforms aim to exclude unlawfully obtained evidence while allowing for the use of evidence collected independently from illegal actions. Highlighting the need for a balanced approach that respects procedural rights and promotes justice, the study advocates for comprehensive legal reforms in Vietnam. It suggests amendments to refine evidence exclusion principles, ensuring they reflect both the Vietnamese context and the progressive features of U.S. criminal justice practices, thereby enhancing the fairness and integrity of criminal proceedings.