Epperson v. Arkansas
- it is unlawful for a teacher in any state-supported school or university "to teach the theory or doctrine that mankind ascended or descended from a lower order of animals," or "to adopt or use in any such institution a textbook that teaches" this theory.
Violation of this law was a misdemeanor and subjected the violator to dismissal from his position.
Justices Hugo Black, John Harlan II and Potter Stewart concurred in the judgment, each writing a separate concurrence. Justice Stewart, for example, would have invalided the statute on vagueness grounds.