The purpose of this study is to explore the linguistic aspects of police FIR using Michael Halliday’s system of transitivity and three-dimensional model of CDA, encompassing the macro-sociological analysis of social practice. FIR is a genre of discourse, referring to a report prepared by the police, which reaches the police station first after the commission of a cognizable offence. FIR needs thorough and careful reading, and very difficult to understand by the people of a particular community. In this regard, the Transitivity system is a medley of six different processes realizing ideational meaning which is further strengthened by CDA, which also helps the people of a community to comprehend complex discourses. In accordance with this study, the researchers used the qualitative approach as a paradigm. They used close reading technique as a strategy and relying on purposive sampling in the selection of data. Further textual analysis is used as a method of analysis. The researcher took five FIRs which were analyzed with respect to the transitivity system. This study reveals that the FIRs conform to five processes out six processes of the transitivity system and the three-dimensional model of CDA. Moreover, this study can be extended to other police reports and common people may easily expand their awareness to understand the language and context of FIRs.