Case or Controversy clause

United States Federal civil procedure doctrines
Justiciability
Advisory opinions
Standing  · Ripeness  · Mootness
Political questions
Jurisdiction
Subject-matter jurisdiction:
Federal question jurisdiction
Diversity jurisdiction
Supplemental jurisdiction
Removal jurisdiction
Amount in controversy
Class Action Fairness Act of 2005
Personal jurisdiction:
Jurisdiction in rem
Minimum contacts
Federalism
Erie doctrine  · Abstention
Sovereign immunity  · Abrogation
· Rooker-Feldman doctrine  ·
Adequate and independent state ground
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The Case or Controversy Clause of Article III of the United States Constitution (found in Art. III, Section 2, Clause 1) has been deemed to impose a requirement that United States federal courts are not permitted to hear cases that do not pose an actual controversy — that is, an actual dispute between adverse parties which is capable of being resolved by the court. The Court and legal scholars commonly refer to the issue of whether a "case or controversy" exists as the concept of standing.

The entire clause in the Constitution reads as follows:

This clause, in addition to setting out the scope of the jurisdiction of the federal judiciary, prohibits courts from issuing advisory opinions, or from hearing cases that are either unripe, meaning that the controversy has not arisen yet, or moot, meaning that the controversy has already been resolved.

The earliest expression by the United States Supreme Court of adherence to this requirement came during the presidency of George Washington. Washington sent a letter to the Court asking for their approval should he choose to seek advice from them from time to time on matters that might not come before the Court in a timely manner. Chief Justice John Jay wrote in his response that, although the members of the Court had great confidence in the ability of the president to receive appropriate advice from his executive officers, the Court itself was constitutionally bound not to go beyond its role as an arbiter of judicial questions.

The most famous case setting forth the parameters of this requirement is Muskrat v. United States, 219 U.S. 346 (1911), in which the Court held that when Congress paid the legal bills for both the plaintiffs and the defendant (in this case the U.S. Treasury department, by designation), then there was no real controversy between the parties, and a judgment of the Court would be the equivalent of an advisory opinion.

The controversial case of Roe v. Wade was a notable exception to the actual controversy requirement. Justice Harry Blackmun wrote that due to the natural limitation of the human gestation period, issues concerning pregnancy will always come to term before the appellate process is complete. Roe v. Wade 410 U.S. 113 (1973). In essence, the rigid application of the actual controversy requirement would effectively deny review. Therefore, the Supreme Court held that a ban on abortion was unconstitutional despite the issue being moot.