Herron v. Southern Pacific Co.

Background

A driver sued a railroad company in federal district court in Phoenix, Arizona for damages after his car collided with the defendant’s train. At the close of the driver’s testimony the trial judge directed a verdict for the railroad, saying the driver was guilty of contributory negligence. The federal appeals court then asked the Supreme Court whether a provision of the Arizona Constitution—section 5, article 18—that says contributory negligence and assumption of risk must always be left to the jury is binding on a federal court sitting in Arizona.

Reasoning

The Supreme Court explained that state constitutional or statutory rules cannot change the essential character or function of federal courts. It said the role of a federal trial judge includes deciding questions of law and directing a verdict where the facts are undisputed and only one legal conclusion follows. The Court therefore held the Arizona constitutional provision does not bind federal courts, and a federal judge may direct a verdict for the defendant when the evidence of contributory negligence or assumption of risk is conclusive and the question becomes one of law.

Real world impact

The decision means people suing in federal court can lose by judge’s directed verdict if their testimony or the evidence clearly shows fault. Federal courts will not be required to follow state constitutional rules that transfer final decision-making power over certain defenses to juries. The ruling preserves federal judges’ authority to oversee trials and stop cases that lack a legally sufficient factual dispute.