Chief Justice Roberts, writing for a majority of five justices, concluded that the school officials did not violate the First Amendment by confiscating the pro-drug banner and suspending the student responsible for it. After reciting the background in Part I of the opinion, in Part II he determined that "school speech" doctrine should apply because Frederick's speech occurred "at a school event"; Part III determined that the speech was "reasonably viewed as promoting illegal drug use"; and Part IV, inquired whether a principal may legally restrict that speech, concluding that she could—under the three existing First Amendment school speech precedents, other Constitutional jurisprudence relating to schools, and a school's "important—indeed, perhaps compelling interest" in deterring drug use by students.