What does the lemon test evaluate? how did the test originate?

The Lemon Test tests courts use to determine whether government action violates the Establishment Clause of the First Amendment of the Constitution. For example, the Lemon Test is a court's tool used to rule on whether the government tried to prohibit the freedom of religious expression.

Lemon v. Kurtzman, 403 U.S. 602, was a case argued before the Supreme Court of the United States. The court ruled in an 8–1 decision that Pennsylvania's Nonpublic Elementary and Secondary Education Act from 1968 was unconstitutional, violating the Establishment Clause of the First Amendment.

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