Including a clergy-led prayer within the events of a public school graduation ceremony violates the Establishment Clause. Decided June 24, 1992 (argued November 6, 1991). Opinion of the Court: Anthony Kennedy → go there Dissenting: Scalia. Applied: the First Amendment → go there Topic: Freedom of religion. Lee v. Weisman, 505 U.S. 577 (1992), was a United States Supreme Court decision regarding school prayer. It was the first major school prayer case decided by the Rehnquist Court. It held that schools may not sponsor clerics to conduct even non-denominational prayer. The Court followed a broad interpretation of the Establishment Clause reaffirming the longstanding principles of the earlier school prayer cases Engel v. Vitale and Abington School District v. Schempp. Wiki link