About 1975, the closed-campus policy and the dress code were discontinued. The change was influenced by the U.S. Supreme Court decision "Tinker v. Des Moines", which stated that students do not "shed their constitutional rights... at the school house door." That year the student population of Arcadia High reached its highest population at about 3,300 students. For the first time, students also were granted representation on the school board. They gained the right to elect a representative to attend school board meetings and speak for the student body.