When a legal right, defense, or cause of action is statutorily eradicated, a legislature has passed a law that permanently removes it from the books. The underlying legal concept no longer exists in any enforceable form once the repealing legislation takes effect. The term signals something stronger than an amendment, which only changes language inside a law that continues to operate. Eradication wipes out the legal foundation itself, so no one can rely on the old rule going forward.
How a Legislature Eradicates a Legal Right
Legislatures do this in one of two ways. The clean way is express repeal: the new law states in its text that a prior statute or common law doctrine is abolished. There is no ambiguity about what happened or what the legislature meant to do.
The messier path is implied repeal. It happens when a legislature passes a comprehensive new law on a subject, and that new law is so thorough that older rules on the same topic cannot logically coexist with it. Courts dislike this result and apply a strong presumption against it. The conflict between the old and new law must be genuinely irreconcilable before a court will find implied repeal. Where two statutes can plausibly be read together, the court will preserve both.
Most repealing laws specify an effective date. That date may be immediate or delayed by weeks, months, or even years. During any gap between passage and effective date, the old law remains fully enforceable. Some repealing statutes also include transition provisions that phase out the old rule gradually.
What Happens to Claims That Already Existed
This is the point most people get wrong. Repealing a statute does not automatically wipe out penalties, forfeitures, or liabilities that someone already incurred while the old law was in effect. Under 1 U.S.C. § 109, the federal saving statute, the repealed law is treated as though it still exists for purposes of enforcing those existing obligations. The only exception is if the repealing law expressly says otherwise.1Office of the Law Revision Counsel. 1 USC 109 Repeal of Statutes as Affecting Existing Liabilities
In practical terms, if you violated a federal law and that law was later repealed, the government can still prosecute you or enforce the penalty you incurred under the old law. The same rule applies to temporary statutes that expire on their own terms. Unless the expiring law specifically releases existing liabilities, those liabilities survive the expiration.
Most states have their own versions of this saving statute. The practical effect is that statutory eradication almost always operates prospectively. It changes the rules going forward without undoing what already happened under the old regime. Learning that a law was repealed and assuming prior obligations disappeared with it is a common and costly mistake.
Constitutional Limits on What Can Be Eradicated
Legislative power to abolish rights is broad but not unlimited. A few constitutional provisions put real boundaries on what a legislature can do and how it can do it.
Bills of Attainder
The Constitution prohibits both Congress and state legislatures from passing a bill of attainder, a law that singles out a specific person or identifiable group for punishment without a trial. Article I, Section 9 bars Congress from doing this, and Article I, Section 10 extends the same prohibition to the states.2Constitution Annotated. Article I Section 9 Clause 3 A legislature cannot use eradication as a backdoor to punish a named individual or a clearly targeted group. If the effect is punitive, courts will strike the law down regardless of its label.
Ex Post Facto Laws
The same constitutional provisions forbid ex post facto laws.3Constitution Annotated. Article I Section 10 Clause 1 State Bills of Attainder Under current Supreme Court doctrine dating to Calder v. Bull (1798), the Ex Post Facto Clause applies only to retroactive criminal legislation. A legislature cannot eradicate a defense that existed when a defendant committed the crime and then prosecute that person as if the defense never existed. The clause does not restrain retroactive civil legislation under the prevailing interpretation.
Due Process
The Fifth and Fourteenth Amendments fill the gap left by the Ex Post Facto Clause when the eradication is civil rather than criminal. When a legislature retroactively adjusts economic rights, courts apply a rational basis test: the retroactive application must be justified by a legitimate legislative purpose. That is a low bar, but it is not nothing. Legislation that ignores reliance on existing law can cross the line, particularly when it strips secured property interests.
When the Target Is Common Law
Many legal rights Americans rely on originated in common law, meaning rules developed by judges through decades or centuries of case decisions. Negligence principles, contract interpretation rules, and property doctrines all have deep common law roots. A legislature can replace any of these by statute, and once it does, the statute takes precedence.
Courts are cautious about finding that a statute has displaced common law. The legislature’s intent to override must be clear from the text. A vague or incomplete statute that merely touches on a topic previously governed by common law will not eradicate the older rule. Courts will read the two as coexisting unless the statute leaves no room for the common law to operate.
Doctrines That Have Actually Been Eradicated
A few well-known examples show the range of what legislatures have chosen to abolish.
Heart Balm Torts
Heart balm torts allowed people to sue over romantic or marital grievances: alienation of affection, criminal conversation (adultery-based claims against a third party), breach of promise to marry, and seduction. These claims were once routine. Starting in the mid-twentieth century, legislatures across the country began abolishing them. Most states have now eradicated these causes of action entirely, closing the courthouse door regardless of the facts. Only a handful of states still permit alienation of affection lawsuits.
Federal Sovereign Immunity (In Part)
Before 1946, the federal government enjoyed near-absolute sovereign immunity, meaning private citizens generally could not sue it for harm caused by federal employees. The Federal Tort Claims Act partially eradicated that doctrine. Under 28 U.S.C. § 1346(b), federal district courts have jurisdiction over claims for money damages when a federal employee’s negligent or wrongful conduct causes injury or property loss, provided a private person would be liable under the same circumstances.4Office of the Law Revision Counsel. 28 USC 1346 United States as Defendant The government is held to the same liability standard as a private individual, though it cannot be held liable for punitive damages.5Office of the Law Revision Counsel. 28 USC 2674 Liability of United States Congress preserved sovereign immunity for a long list of situations, including discretionary government decisions, certain intentional torts, fiscal operations of the Treasury, and military combat activities.6Office of the Law Revision Counsel. 28 USC 2680 Exceptions The FTCA shows that eradication is not always all or nothing; a legislature can abolish a doctrine in some contexts while keeping it in others.
Common Law Marriage
Common law marriage, which allowed a couple to be legally married without a license or ceremony if they lived together and held themselves out as spouses, has been statutorily eradicated in a large majority of states. Only about ten states and the District of Columbia still recognize it in some form. Elsewhere, legislatures have passed laws requiring a formal license and registration process. Couples who skip those steps receive no marital legal protections regardless of how long they have lived together. States that abolished common law marriage typically still honor marriages that were validly formed under the old rules before the repealing statute took effect.
Sunset Provisions: Laws That Eradicate Themselves
Not all eradication requires a new repealing law. Some statutes contain built-in expiration dates called sunset provisions. When the expiration date arrives and the legislature has not voted to renew the law, it ceases to exist automatically. The default is flipped: the legislature must act to keep the law alive, and inaction produces termination.
Sunset provisions are commonly attached to temporary programs, emergency measures, and agencies the legislature wants to reevaluate on a schedule. The federal saving statute applies to expiring temporary statutes the same way it applies to expressly repealed ones, so liabilities incurred before the sunset date survive the expiration unless the statute says otherwise.1Office of the Law Revision Counsel. 1 USC 109 Repeal of Statutes as Affecting Existing Liabilities
What Eradication Means for Someone With an Old Claim
Once a legal right has been eradicated, anyone who previously relied on it loses the ability to enforce it going forward. A person who had a valid alienation of affection claim can no longer file that lawsuit after the legislature abolishes the cause of action, even if the underlying events happened while the claim still existed. Whether the saving statute preserves a particular claim turns on whether it had already ripened into an enforceable liability before the repeal took effect.
Two situations trip people up. A doctrine that appears in old case law may have been quietly eradicated by statute years earlier, making it useless no matter how favorable the facts. Less often, a statute still on the books may have been impliedly repealed by a later comprehensive law, though courts resist that conclusion without clear evidence of irreconcilable conflict. Either way, the practical result is the same: the legal theory is gone, and only new legislation can bring it back.