It was a 1985 US Supreme Court decision arising out of an Alabama case challenging the states establishment of a one minute silent prayer period at the beginning of each school day. The one minute prayer was ruled unconstitutional.
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Did Alabama law violate the First Amendment's Establishment
Clause.
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No, the US Supreme court found in: Wallace v. Jaffree, 472 U.S.
38 (1985), that the law was Unconstitutional and struck it
down.