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In Lemon v. Kurtzman (403 US 602; 1971), the Supreme Court of the United States reversed a panel of the United States Court of Appeals for the Third Circuit which had held that Pennsylvania's 1968 Nonpublic Elementary and Secondary Education Act, which allowed the state Superintendent of Public Instruction to reimburse nonpublic schools (most of which were Catholic) for teachers' salaries, textbooks and instructional materials, did not violate the Establishment or Free Exercise clauses of the First Amendment. The decision also upheld a decision of the First Circuit which had struck down the Rhode Island Salary Supplement Actlaw providing state funds to supplement salaries at nonpublic elemetary schools by 15%. As in Pennsylvania, most of these funds were spent on Catholic schools.
The Court's decision established the Lemon test, which details the requirements for United States legislation concerning religion. It consists of three prongs:
If any of these three prongs is violated, the government's action is deemed unconstitutional under the Establishment Clause of the First Amendment to the United States Constitution.
The act stipulated that "eligible teachers must teach only courses offered in the public schools, using only materials used in the public schools, and must agree not to teach courses in religion." Still, a three-judge panel found 25% of the State's elementary students attended nonpublic schools, about 95% of the these attended Antonin Scalia and Clarence Thomas, lack of a clear reaffirmation of the central tenets of Lemon over the years since the 1980s, and inconsistent application in major Establishment Clause cases has led some legal commentators and lower court judges to believe that Lemon's days are numbered, and that the Court has implicitly left the decision of whether to apply the test in a specific case up to lower courts. This has resulted in a patchwork pattern of enforcement in circuit courts across the nation; while some courts apply Lemon in all or most cases, others apply it in few or none. The Supreme Court itself has applied the Lemon test as recently as Santa Fe Independent School District v. Doe, 530 U.S. 290 (2000).