This study describes the construction of obligation and prohibition in the body of Law Number 20 of 2003 concerning the National Education System (Articles 1–77) from the perspective of forensic linguistics. A descriptive qualitative method was used with documentation and note-taking techniques. The study found 37 data: 24 constructions of obligation and normative responsibility and 13 constructions of prohibition and sanction. Obligation is marked by wajib (12), harus (4), berkewajiban (6), and bertanggung jawab (2). Wajib is always followed by an active verb and is most often attached to the Government, whereas berkewajiban is attached only to non-governmental parties. Harus appears mostly in passive constructions, two of which do not state the obligated party. Explicit prohibition with dilarang occurs only in Article 21(2), while twelve criminal provisions in Articles 67–71 imply prohibition through the relation between the act and the sanction, eight of them by referring to other articles. The findings show that normative meaning is shaped by the choice of markers together with the subject, voice, clause structure, and cross-references between articles.
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