Written by attorneys · grounded in primary & secondary sources — see below
An issue or controversy that has lost practical significance because intervening events have eliminated any live dispute between the parties. A court's decision on the point would have no effect on the parties' rights or obligations.
Sources & Authorities
How it applies
Common Examples
6
Graduating Student Ends Challenge
Megan Moore sued a law school over its admissions policy while still enrolled. By the time the case reached the court of appeals she had completed all requirements and was set to graduate regardless of the outcome. The court dismissed the appeal because no live controversy remained between the parties.
Pregnancy Ends Before Appeal
Melissa Mills challenged a state abortion restriction while pregnant. By the time her appeal reached the highest court she had already given birth. The passage of time removed any ongoing controversy that a ruling could resolve for her personally.
Select any source to read its text and confirm it supports the definition.
Cases
Casebooks
Hornbooks
Roe v. Wade410 U.S. 113 (1973)
Union Contract Dispute Resolved
Marathon Logistics and its union litigated whether a collective bargaining agreement required arbitration of certain grievances. Before the Supreme Court could decide the issue the parties executed a new agreement that superseded the old one. The original dispute no longer affected their rights.
Textile Workers Union of Am. v. Lincoln Mills of Ala.353 U.S. 448 (1957)
Citizen Suit Loses Ongoing Harm
Meridian Motors faced a citizen suit alleging ongoing permit violations. After the company installed new equipment that brought it into compliance the alleged violations ceased. The court found that any ruling would no longer affect the parties' legal positions.
Steel Co. v. Citizens for a Better Environment523 U.S. 83, 90, 118 S. Ct. 1003, 1010, 140 L. Ed. 2d 210 (1998)
Merger Terms Become Irrelevant
Monarch Pharmaceuticals and a target company litigated whether certain merger agreement provisions remained enforceable after the board changed its recommendation. The deal closed on revised terms before the court could rule. The original dispute no longer controlled any party's rights.
Maxwell Manufacturing appealed a large judgment on the ground that the trial judge should have been disqualified. While the appeal was pending the parties settled the underlying dispute and the judgment was vacated. The recusal question no longer affected any live controversy between them.
Caperton v. A. T. Massey Coal Co.556 U.S. 868 (2009)
Common questions
Frequently Asked
3
When does a case become moot in federal court?+
A case becomes moot when intervening events remove any live controversy between the parties so that a court decision would have no effect on their rights. The primary authority illustrates this with a law student challenging admissions who is about to graduate regardless of the outcome.
Supporting sources
Does dismissal as moot prevent a fee award in a derivative suit?+
No. Courts may still award expenses to a derivative plaintiff if the suit produced a substantial benefit to the corporation even when the case is later dismissed as moot. The MC questions confirm that the key inquiry is causation and corporate benefit rather than formal victory.
Supporting sources
Can a class action continue after the named plaintiff's individual claim becomes moot?+
Yes. The mootness of the named representative's individual claim does not necessarily moot the entire class action. The class may continue even if the representative's personal claim is resolved.
Supporting sources
410 U.S. 113 (1973)Constitutional Law
…so short that the pregnancy will come to term before the usual appellate process is complete. If that termination makes a case moot, pregnancy litigation seldom will survive much beyond the trial stage, and appellate review will be effectively denied. Our law should not be that rigid. We therefore agree with the…
Criminal Law Constitutional ProtectionsConstitutional protections of accused persons · Arrest, search, and seizure [Fourth Amendment]NEXTGENIntermediate