History
Precedents and Stare Decisis in Constitutional Adjudication
Quick fact
The U.S. Supreme Court has overruled its own constitutional precedents more than 230 times since 1810, most notably in Brown v. Board of Education (1954) and Dobbs v. Jackson Women's Health (2022).
Why this is interesting
You might think a Supreme Court ruling is final, but sometimes the Court reverses itself. How can the law both honor the past and change the future?
Read the full explanation
Understanding Precedents and Stare Decisis in Constitutional Adjudication
Imagine a judge deciding a case. Rather than reinventing the law each time, they look to earlier decisions on similar issues—these are precedents. The principle that courts should follow their own prior rulings is called 'stare decisis,' Latin for 'to stand by things decided.' In constitutional adjudication, this means that once a court interprets a constitutional provision, future courts are expected to treat that interpretation as an authoritative rule. So, if a court ruled that a law violates free speech, later similar cases will likely be decided the same way. This provides stability, predictability, and fairness, because people know what the law is and are treated consistently over time. However, the court is not completely locked in. The Supreme Court can overturn its own precedents when circumstances change or the earlier decision was clearly wrong.
A deeper explanation
Stare decisis works through two mechanisms: vertical and horizontal. Vertical stare decisis means lower courts are absolutely bound by higher courts' rulings—a district court cannot ignore a Supreme Court decision. Horizontal stare decisis applies to the Supreme Court itself: it treats its own precedents as binding but can overrule them under exceptional circumstances. The Court considers factors like the quality of the prior decision's reasoning, whether it has become unworkable, whether social or factual circumstances have changed dramatically, and whether people have relied on the precedent. The decision in Brown v. Board (1954) overturned the 'separate but equal' doctrine of Plessy v. Ferguson (1896), reasoning that segregation in public schools was inherently unequal and that psychological evidence showed its harmful effects. More recently, Dobbs v. Jackson (2022) overruled Roe v. Wade (1973), asserting that the right to abortion was not deeply rooted in American history and lacked sufficient constitutional grounding. These examples show that stare decisis is not an absolute rule but a principle of stability that yields when the Court believes earlier reasoning was flawed or societal evolution demands change. This doctrine is crucial for constitutionality because it balances the need for continuity with the flexibility to correct errors and adapt to new conditions.