1975)[1] was a 1975 legal case in which the United States Court of Appeals for the Sixth Circuit struck down Tennessee's law regarding the teaching of "equal time" of evolution and creationism in public school science classes because it violated the Establishment clause of the US Constitution.

[2] The creationist movement reacted to the decision by turning to the promotion of the teaching of creationism in school science classes as equal to evolutionary theory.

[1][3] The Federal District Court ruling was that the Tennessee law was "a clearly defined preferential position for the Biblical version of creation as opposed to any account of the development of man based on scientific research and reasoning.

The Court stated (quoting from a prior decision): "While study of religions and of the Bible from a literary and historic viewpoint, presented objectively as part of a secular program of education, need not collide with the First Amendment's prohibition, the State may not adopt programs or practices in its public schools or colleges which "aid or oppose" any religion.

This came to court as McLean v. Arkansas (1982), which resulted in a detailed ruling that it was similarly unconstitutional to teach this in public school science classes.