The Mobile Brigade Corps (Brimob) stands at the frontline of counterterrorism in Indonesia, yet operates under a legal framework designed for ordinary policing. This study analyses two issues: the juridical regulation of Brimob’s authority and its implementation from the perspectives of legality and legal accountability. It employs juridical-empirical (socio-legal) research combining statutory, conceptual, and case approaches, with Operation Tinombala (2015–2023) as the case study. Primary data were gathered through interviews with Brimob personnel and BNPT officials, complemented by vertical-horizontal synchronisation analysis of the relevant regulations. The findings show that Brimob’s authority rests on a valid attribution but contains regulatory disharmony particularly between Law Number 5 of 2018 and unrevised Chief of Police Regulations, and between the police and defence legal regimes in joint operations. Implementation reveals a das sollen–das sein gap in proportionality of force, command accountability, and external oversight. The novelty lies in disaggregating that gap into three typologies normative, implementative, and institutional each demanding a distinct remedy, thereby shifting the burden of reform from individual officers to regulatory design. The study concludes that reform of Brimob’s legal framework is urgent and must be differentiated according to the typology of the gap, rather than uniform.
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