The supreme court formerly used the lemon test to check for constitutional violations of religious liberties according to the Establishment clause.
The Establishment Clause of the First Amendment to the United States Constitution and the Free Exercise Clause of that Amendment combine to produce the constitutional right of freedom of religion in American law. The Establishment Clause serves as a dual protection, forbidding both political manipulation of religion and religious abuse of the state. The Establishment Clause is a restriction placed on the US Congress that prevents it from introducing laws that would force an establishment of religion. In general, this makes it unlawful for the government to support theocracy or a particular religion through taxation. The Establishment Clause forbids Congress from elevating or favouring one religion over another, but it does not forbid the government from interfering in matters of religion in order to provide allowances for religious observances and rituals.
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