Chapter 1.4: Stare Decisis

The *stare decisis* doctrine forms a foundational pillar of the American legal system by requiring courts to follow established legal *precedent* when resolving current disputes. Operating both *vertically**—where lower tribunals must yield to the mandatory rulings of higher courts—and **horizontally**, where courts consider their own prior judgments, this practice promotes judicial efficiency, fairness, and predictability. Despite its importance in maintaining consistency, stare decisis functions as a discretionary policy rather than an absolute rule, allowing the U.S. Supreme Court to **overrule* severely flawed or outdated decisions, particularly in constitutional matters. Because amending the Constitution to reverse judicial errors is exceedingly difficult, the Court applies a more flexible approach to constitutional precedents compared to federal statutes. Ultimately, while judges heavily rely on historical rulings to maintain public trust and legal stability, they retain the power to discard previous opinions when societal evolution or poor reasoning demands a correction.