12 Angry Men to The Verdict to Anatomy of a Fall. The genre that takes American law's most-formal spaces and finds the human drama inside them.
The legal drama is one of the cinema's most-structurally-clean genres. The rules of the courtroom — opening statement, witness examination, cross-examination, closing argument, verdict — provide a built-in three-act framework. The dramatic tension is structural: someone is in legal jeopardy, the evidence is mostly known, the question is how the rules and the rhetoric play out.
Some films work in the legal-drama tradition without being formally courtroom films. Spotlight (2015) is a journalism procedural that ends with the legal consequences of the reporting; Erin Brockovich (2000) is a class-action lawsuit film told from the paralegal's perspective; Michael Clayton (2007) is a corporate-law-firm thriller. All work in the genre's tradition without using its standard formal structure.