You know that a court needs jurisdiction over the kind of case and the parties. Federal courts face one more gate, written into Article III itself: they may decide only real disputes.
Key idea
Article III extends the federal judicial power to "Cases" and "Controversies." So federal courts decide real disputes between adverse parties, with a concrete stake in the result, and they do not give advisory opinions. The doctrines that enforce this limit are called justiciability: standing, ripeness, mootness and the political question doctrine.
Why it works
The limit keeps judges in their role. Courts decide questions best when two sides with something real at stake argue them on actual facts; abstract questions, answered in advance, would make judges into advisers or lawmakers. The tradition began early. In 1793 President Washington, through Secretary of State Jefferson, sent the justices a list of questions about treaties and neutrality in the European war. The justices declined to answer, pointing to the separation of powers and their role as a court of last resort. In Muskrat v. United States (1911) the Court refused to decide a suit Congress had arranged so the Court could test a law, because there was no real adversary. Federal courts may issue declaratory judgments (statements of the parties' rights) only when an actual controversy exists.
| Doctrine | The question it asks |
|---|---|
| Standing | Is this the right plaintiff: one personally injured? |
| Ripeness | Has the dispute become concrete, or is it too early? |
| Mootness | Is there still a live dispute, or is it too late? |
| Political question | Is this a question for the political branches, not the courts? |
Worked example: A request for advice
A senator writes to the Supreme Court asking whether a bill she plans to introduce would be constitutional. What will the Court do?
- There is no case: no parties, no injury, no law yet.
- Answering would be an advisory opinion, which Article III does not allow.
Answer: Decline. The question can be decided only if the law passes and someone with standing challenges it.
Worked example: Some state courts differ
Massachusetts' governor asks the state's Supreme Judicial Court whether a proposed law would violate the state constitution. Can that court answer?
- Article III binds federal courts, not state courts.
- The Massachusetts Constitution of 1780 lets the governor and legislature ask the justices for opinions on important questions of law.
- Several other states allow advisory opinions too.
Answer: Yes. Its state constitution allows advisory opinions.
Common mistake
Thinking the Supreme Court can rule on any law it thinks unconstitutional. A court can rule only when a proper party brings a real case, and only on the questions that case presents. Many state courts can give advisory opinions, but federal courts cannot. Check: who is the plaintiff, what is the injury, and what would a ruling change for them?
This is an educational course, not legal advice.