An expert witness is a person with specialized knowledge who provides testimony to clarify technical or scientific aspects in criminal cases. In Indonesia, experts are appointed based on professional competence, without a centralized certification system, while the Netherlands has a strict system through the Netherlands Register of Court Experts (NRGD), which requires verification and certification of expertise. This difference impacts the quality, objectivity, and evidentiary value of expert testimony. This research is a normative juridical study with a qualitative approach, focusing on regulations, literature reviews, and analysis. The study finds that while both Indonesia and the Netherlands emphasize the importance of special expertise, Indonesia lacks a formal accreditation system for expert witnesses, whereas the Netherlands has institutions like NRGD and NFI (Netherlands Forensic Institute) to regulate and certify expertise. The legal system differences between Indonesia and the Netherlands create complexities in the role of expert witnesses, affecting the evidentiary value and the professionalism and independence of experts in court. Despite both countries following the civil law system, their distinct legal frameworks lead to significant variations in expert witness roles and the reliability of their testimony.
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