The Butler Act was a 1925 Tennessee law prohibiting public school teachers from denying the Biblical account of mankind's origin. The law also prevented the teaching of the evolution of man from what it referred to as lower orders of animals in place of the Biblical account. The law was introduced by Tennessee House of Representatives member John Washington Butler, from whom the law got its name. It was enacted as Tennessee Code Annotated Title 49 (Education) Section 1922, having been signed into law by Tennessee governor Austin Peay.

The law was challenged later that year in a famous trial in Dayton, Tennessee called the Scopes Trial which included a raucous confrontation between prosecution attorney and fundamentalist religious leader, William Jennings Bryan, and noted defense attorney and religious agnostic, Clarence Darrow.

It was repealed in 1967.



The Scopes Trial, formally The State of Tennessee v. John Thomas Scopes, and commonly referred to as the Scopes Monkey Trial, was an American legal case from July 10 to July 21, 1925 in which a high school teacher, John T. Scopes, was accused of violating Tennessee's Butler Act, which had made it unlawful to teach human evolution in any state-funded school. The trial was deliberately staged in order to attract publicity to the small town of Dayton, Tennessee, where it was held. Scopes was unsure whether he had ever actually taught evolution, but he incriminated himself deliberately so the case could have a defendant.Scopes was found guilty and was fined $100 (equivalent to $1,500 in 2020), but the verdict was overturned on a technicality. The trial served its purpose of drawing intense national publicity, as national reporters flocked to Dayton to cover the high-profile lawyers who had agreed to represent each side. William Jennings Bryan, three-time presidential candidate and former Secretary of State, argued for the prosecution, while Clarence Darrow served as the defense attorney for Scopes. The trial publicized the Fundamentalist–Modernist controversy, which set Modernists, who said evolution was not inconsistent with religion, against Fundamentalists, who said the Word of God as revealed in the Bible took priority over all human knowledge. The case was thus seen both as a theological contest and as a trial on whether evolution should be taught in schools.