The Supreme Court of Pennsylvania has held that inclusion of an invocation and benediction at a public high school commencement, at which attendance was voluntary, violated neither the free exercise clause nor the establishment clause of the first amendment of the United States Constitution nor that section of the Pennsylvania Constitution governing free exercise and establishment of religion.
Wiest v. Mt. Lebanon School District, 457 Pa. 166, 320 A.2d 362, cert. denied, 419 U.S. 967 (1974).
John C. Bates,
Constitutional Law - First Amendment - Free Exercise Clause - Establishment Clause - Schools and School Districts,
Duq. L. Rev.
Available at: https://dsc.duq.edu/dlr/vol13/iss3/9