In Kennedy v. Bremerton School District, the Supreme Court ruled that a
coach-led prayer on the 50-yard line did not violate the establishment
clause of the First Amendment.

Marsh v. Chambers (1983) found that the practice of hiring a chaplain to
open the legislative day with prayer did not violate the establishment
clause of the First Amendment.

Town of Greece v. Galloway (2014) ruled a town’s practice of having prayer
before town meetings did not violate the Establishment Clause of the First
Amendment.