The Public Policy Exception
Every state's law differs from every other's, and none of those differences is a reason to refuse. The exception operates only where applying the other law would offend something the forum treats as fundamental, and courts invoke it rarely.

The rule in short
A forum may decline to apply the law of another state that its conflicts analysis would otherwise select, where applying it would violate a strong public policy of the forum. The threshold is high: a difference in rule, even a substantial one, is not enough, and courts have consistently said that applying another state's law is not made objectionable by disagreeing with it.
Parties who dislike the law a conflicts analysis has selected reach for the public policy exception more often than any other argument, and it succeeds less often than any other argument. Understanding why the threshold is set where it is explains both the rarity and the shape of the cases that do succeed.
What the exception is
A power to decline, not to substitute. The forum refuses to apply a rule of another state that its own conflicts analysis would otherwise select, and applies its own law to that issue instead.
Directed at the result, not the rule. The question is whether applying the foreign rule in this case would offend the forum's policy, which means a rule that is objectionable in one application may be unobjectionable in another.
Narrow by design. A broad exception would swallow the whole conflicts framework, since a forum that applied its own law whenever it preferred it would never apply anyone else's.
Formulated demandingly. The classic statement asks whether the foreign law would violate a fundamental principle of justice, a prevalent conception of good morals, or a deep-rooted tradition of the common weal — language chosen to discourage its use.
And it is distinct from the contractual version. The related but separate question of when a chosen law is displaced by a more interested state's fundamental policy is examined in when a court sets the chosen law aside.
What does not qualify
A more generous rule at home. The forum's own law providing a larger recovery, a longer period or a lower standard of proof is not a policy objection.
A harsh result. Outcomes that seem unfair on the facts are the ordinary consequence of different states making different choices, and courts have repeatedly declined to treat unfairness as sufficient.
The absence of a cause of action. That the other state does not recognize a claim the forum does is a difference rather than an affront, and applying it is generally required.
A damages limitation. Caps, limits on non-economic recovery and restrictions on punitive damages have generally been applied even where the forum has none, which is examined in damages caps that differ between two states.
Disagreement with the policy. A judge who thinks the other state's legislature made the wrong choice has identified a difference of opinion, not a violation of fundamental principle.
| Objection raised | Threshold met | Why |
|---|---|---|
| The other state's rule is less generous | No | A difference is not an affront |
| The result is harsh on these facts | No | Harshness is an ordinary consequence |
| The other state has no such cause of action | No | Absence is a policy choice |
| A non-waivable statutory right would be surrendered | Yes | The legislature said it cannot be waived |
| A constitutional guarantee would be defeated | Yes | The strongest form of the objection |
What does qualify
Non-waivable statutory rights. Where a legislature has declared that rights cannot be surrendered by agreement, applying a law that surrenders them defeats the statute directly.
Constitutional provisions. A rule inconsistent with a right the forum's constitution guarantees is the strongest form of the objection.
Protective legislation for a class. Employment, consumer, insurance and franchise statutes exist to protect people who did not negotiate, and courts read them as expressing policies not subject to evasion, which is the analysis behind states that refuse to enforce a non-compete.
Rules the forum has expressly rejected. Where a state has legislated to abolish a doctrine, applying another state's surviving version of it engages the policy directly rather than incidentally.
And even then, narrowly. The displacement extends only to the offending issue. The rest of the case continues under the selected law, which is why these outcomes are partial rather than wholesale.
A submission that opens by describing how unfair the result would be tells the court that no statute or constitutional provision is available. One that opens by quoting a specific non-waivable right and showing that applying the foreign rule would defeat it is a different kind of argument and is received differently. Where neither is available, the stronger point is almost always that the analysis selected the wrong state.
The limit: full faith and credit
Judgments are different from law. The constitutional obligation to give full faith and credit to the judicial proceedings of other states applies with far more force to judgments than to rules of decision.
Public policy is generally not an answer to a judgment. A state must recognize a sister-state judgment whether or not it approves of the law that produced it, and objections have to be jurisdictional or based on fraud.
Which channels the argument. A party unhappy with a judgment attacks it where it was rendered, or attacks the rendering court's jurisdiction, as described in a default judgment entered in another state.
The distinction is deliberate. A system in which every state could decline to honor judgments it disliked would produce exactly the fragmentation the clause exists to prevent.
So the exception lives on the law side. Which is where it should be argued, sparingly, with a statute or a constitutional provision in hand rather than an appeal to fairness, and where it is one input among the several set out in the test courts use for contracts.
How to argue it, and when not to
Lead with the provision, not the outcome. An argument that begins by describing how unfair the result would be signals that no statute or constitutional provision is available. An argument that begins by identifying a specific non-waivable right, quoting it, and showing that applying the foreign rule would defeat it is a different kind of submission and is taken differently.
Show that the forum has actually committed to the policy. Courts look for evidence that the state has taken a considered position: a statute enacted in terms, a constitutional amendment, a legislative history rejecting the contrary rule. A policy inferred from the general tenor of the state's law rarely carries the argument.
Frame it narrowly. Asking a court to disapply one specific rule on one specific issue is far more likely to succeed than asking it to reject another state's law generally. Courts are reluctant to make broad pronouncements about a neighbor's legal system and are comparatively willing to decline one provision.
Accept the partial result. A successful objection displaces the offending rule and leaves the rest of the selected law in place. Parties who argue the exception expecting a wholesale switch to forum law are usually disappointed even when they win.
And consider whether a better argument exists. Very often the real point is not that the foreign rule is offensive but that the conflicts analysis selected the wrong state, or that a protective statute applies of its own force regardless of the choice-of-law outcome. Both are stronger arguments than the exception and both are frequently overlooked in favor of it.
The reason the exception is invoked so often and succeeds so rarely is that it is the argument that feels available when the others have failed. A party facing an unfavorable rule selected by a defensible analysis has run out of technical objections and reaches for principle. Courts recognize the pattern and discount accordingly, which means the occasional genuine case — a non-waivable right about to be waived, a constitutional guarantee about to be circumvented — has to work harder than it should to be distinguished from the many that are simply disappointment expressed in stronger language.
A final observation about where the doctrine is heading. As states diverge more sharply on subjects where they once broadly agreed, the number of cases in which one state's rule is genuinely unacceptable to another rises, and the exception is being asked to do more work than its formulation contemplates. Courts have so far responded by holding the threshold where it is and resolving the pressure through the ordinary analysis instead, deciding which state's law governs rather than declaring another state's law offensive. That is the more durable route, and it is the one a practitioner should generally take: the argument that the forum has the closer connection to the issue succeeds far more often than the argument that its neighbor has gone too far.
Points to carry away
- A different rule is not a public policy objection, however substantial the difference.
- The threshold is a deep-rooted policy, generally constitutional or statutory.
- The exception is applied to another state's law, not to its judgments.
- Full faith and credit sharply limits refusal to recognize sister-state judgments.
- The usual effect is that the forum applies its own law to the issue only.
Questions readers ask
How different does the other state's law have to be?
Different is never enough by itself. Courts have been consistent that the exception is not engaged merely because the forum would decide the question the other way, or because its own rule is more generous, or because the result strikes the judge as harsh. The formulation most often used asks whether applying the foreign rule would violate some fundamental principle of justice, some prevalent conception of good morals, or some deep-rooted tradition of the common weal. In practice courts look for a constitutional provision or a statute declaring rights that cannot be waived.
Does the exception apply to judgments as well as to law?
Far less readily, and this is a distinction of real importance. A state has considerable latitude to decline to apply another state's law, and almost none to refuse recognition of another state's judgment. Full faith and credit requires judgments to be given the effect they have where rendered, and public policy is generally not an available objection. A party unhappy with a judgment must attack it where it was rendered or on jurisdictional grounds, not by asking a second state to disapprove of the underlying rule.
What happens when the exception succeeds?
The forum declines to apply the offending rule and applies its own law to that issue. It does not usually mean the whole case is decided under forum law: the displacement is generally as narrow as the objection. A court that refuses to enforce another state's rule on one point may continue to apply that state's law to everything else in the dispute, which produces the partial outcomes described elsewhere on this site and is deliberate rather than untidy.
Sources
- U.S. Constitution, Article IV — Full Faith and Credit Clauselaw.cornell.edu
- 28 U.S.C. § 1738 — State and Territorial statutes and judicial proceedings; full faith and creditlaw.cornell.edu
- Legal Information Institute — Public Policylaw.cornell.edu
- Legal Information Institute — Conflict of Lawslaw.cornell.edu
- Legal Information Institute — Comitylaw.cornell.edu
- United States Courts — Court Role and Structureuscourts.gov
Right Way Review is a publication, not a law firm. This article states general rules and cites its sources; it is not advice about any particular case, and the law differs by state and changes over time.
More in Which State's Law Applies
Proving Another State's Law in Court
Under the federal rule and its state equivalents, a party intending to raise an issue about the law of another state must give notice, generally in a pleading or by separate written notice. The court then determines that law as a question of law rather than as a question of fact, and may consider any relevant material whether or not submitted by a party and whether or not admissible in evidence.
When a Court Sets the Chosen Law Aside
Courts decline to apply a chosen law on four broad grounds. The chosen state may have no substantial relationship to the parties or the transaction and no other reasonable basis may exist for the choice. Applying the chosen law may contravene a fundamental policy of a state with a materially greater interest in the issue. A statute may expressly void the clause, as several states have done for employment covenants and consumer contracts.
Two Laws, One Transaction: Splitting the Question
Issue-by-issue analysis, sometimes called depecage, follows from the way the modern choice-of-law test is framed: the question is which state has the most significant relationship to the issue in question. Because different issues implicate different contacts and different policies, a single dispute can be governed by one state's law on the standard of care, another's on damages, and a third's on a limitation defense.


