The Lemon Test
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
Lemon v. Kurtzman (1971) set a three-part establishment test: a secular purpose, no advancing or inhibiting religion, no excessive entanglement.
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For decades a law failing any one of the three prongs failed the clause.
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Know this test as history: the Court has since abandoned it, and the next entry says what replaced it.