the First Amendment's adoption and that James Madison, not Jefferson, was the principal drafter. However, Madison himself often wrote of "perfect separation between the ecclesiastical and civil matters" (1822 letter to Livingston), which means the authority of the church (that which comes from the church) is decided by church authority, and that which is decided in civil government is decided by civil authorities; neither may decree law or policy in each other's realm. Another description reads: "line of separation between the rights of religion and the civil authority... entire abstinence of the government" (1832 letter Rev. Adams), and "practical distinction between Religion and Civil Government as essential to the purity of both, and as guaranteed by the Constitution of the United States" (1811 letter to Baptist Churches). In Lemon v. Kurtzman (1971), the Supreme Court ruled that government may not "excessively entangle" with religion. The case involved two Pennsylvania laws: one permitting the state to "purchase" services in secular fields from religious schools, and the other permitting the state to pay a percentage of the salaries of private school teachers, including teachers in religious institutions. The Supreme Court found that the government was "excessively entangled" with religion, and invalidated the statutes in question. The excessive entanglement test, together with the secular purpose and primary effect tests thereafter became known as the Lemon test, which judges have often used to test the constitutionality of a statute on establishment clause grounds. The Supreme Court decided Committee for Public Education & Religious Liberty v. Nyquist and Sloan v. Lemon in 1973. In both cases, states—New York and Pennsylvania—had enacted laws whereby public tax revenues would be paid to low-income parents so as to permit them to send students to private schools. It was held that in both cases, the state unconstitutionally provided aid to religious organizations. The ruling was partially reversed in Mueller v. Allen (1983). There, the Court upheld a Minnesota statute permitting the use of tax revenues to reimburse parents of students. The Court noted that the Minnesota statute granted such aid to parents of all students, whether they attended public or private schools. While the Court has prevented states from directly funding parochial schools, it has not stopped them from aiding religious colleges and universities. In Tilton v. Richardson (1971), the Court permitted the use of public funds for the construction of facilities in religious institutions of higher learning. It