The death of a Sumatran tiger (Panthera tigris sumatrae) in Mukomuko Regency, Bengkulu, in 2026 is a clear indicator of serious problems in the effectiveness of environmental law in Indonesia. This study aims to analyze the problems of environmental law enforcement regarding the protection of protected animals through a case study of the death of the Sumatran tiger. The research method used is normative juridical with a legislative and conceptual approach. The analysis was conducted using the theory of sustainable development and the precautionary principle. The results of the study indicate a significant gap between regulatory aspects (law on books)—such as Law No. 5 of 1990 and Law No. 32 of 2009—and its implementation in the field (law in action). The main problems stem from weak supervision of conservation areas, lack of coordination between institutions, and the dominance of repressive approaches (sanctions) compared to preventive approaches (preventing habitat damage and resolving human-animal conflicts). This study concludes that effective environmental law enforcement requires strengthening integrated preventive policies and habitat monitoring based on comprehensive ecosystem sustainability.
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