When Teaching Evolution Became a Crime

On May 7, 1925, high school teacher John Thomas Scopes was arrested in Dayton, Tennessee, for violating a state law that had been on the books for less than three months. His crime: teaching human evolution to his biology class. What followed was one of the most publicized trials in American legal history—a clash between science and religious doctrine that would dominate headlines and divide the nation.

The Butler Act, passed by the Tennessee legislature in March 1925, made it illegal for teachers in public schools to present "any theory that denies the story of the Divine Creation of man as taught in the Bible, and to teach instead that man has descended from a lower order of animals." The law represented a victory for fundamentalist Christian groups concerned that Darwinian evolution was undermining biblical authority.

But the trial itself was something of a setup. Dayton's business leaders, seeking publicity for their struggling town, encouraged Scopes to participate in a test case. The American Civil Liberties Union, eager to challenge the Butler Act's constitutionality, had publicly offered to defend anyone prosecuted under it. Scopes, a 24-year-old math and physics teacher who had substituted in biology class, agreed to be the defendant—despite uncertainty about whether he had actually taught evolution directly.

The courtroom became theater. When the trial began on July 10, 1925, it attracted an unprecedented level of media attention. This was the first trial to be broadcast live on radio, reaching audiences across the country. Dayton was overrun with journalists, curious onlookers, and religious activists. The atmosphere outside the courthouse was carnival-like, with vendors selling refreshments and religious signs covering the town.

The legal teams were heavyweight. The prosecution was led by William Jennings Bryan, the former U.S. Secretary of State and three-time presidential candidate, who had become the face of American fundamentalism. Defending Scopes was Clarence Darrow, one of the nation's most renowned criminal defense attorneys, joined by Arthur Garfield Hays of the ACLU. Their battle was less about Scopes' actions than about the proper relationship between religion, science, and state authority.

Judge John T. Raulston controlled the trial's scope tightly. He ruled that expert testimony about evolution's scientific validity was irrelevant and that constitutional questions about free speech and religious liberty were off-limits. The trial would focus solely on one question: Did Scopes teach evolution? The answer was yes—he admitted it, and three students testified before the grand jury that he had taught an evolution chapter from the textbook.

With the factual question settled, the trial's drama faded. On July 21, 1925, the jury deliberated for just nine minutes before returning a guilty verdict. Scopes was convicted of a misdemeanor and fined $100—the maximum penalty under the Butler Act.

But the legal battle wasn't over. The Tennessee Supreme Court reversed the conviction on a technicality: the judge, rather than the jury, had imposed the fine. However, the court upheld the Butler Act itself as constitutional, finding it neither vague nor an improper regulation of teacher speech. The law remained on the books for another 42 years until 1967.

The Scopes Trial did not settle the evolution debate. Instead, it became a symbol of the fundamental tension between scientific education and religious belief in public institutions—a tension that continues to shape American education policy today. The trial publicized the modernist-fundamentalist controversy and made evolution teaching a flashpoint in American culture wars that show no signs of ending.

Sources

https://en.wikipedia.org/wiki/Scopes_trial

https://mag.uchicago.edu/law-policy-society/evolution-trial

https://www.britannica.com/event/Scopes-Trial

https://www.discovery.org/a/fact-myth-and-the-scopes-monkey-trial/

https://www.mentalfloss.com/history/law/scopes-monkey-trial-facts