Under Teague v. Lane, 489 U.S. 288 (1989), a federal habeas court generally cannot apply a new constitutional rule of criminal procedure to a conviction that was already final when the rule was announced. The retroactivity doctrine from Teague v. Lane still governs today, with one narrow exception that survives: new substantive rules do apply backward. New procedural rules, no matter how important, do not.
The Core Rule and Why It Exists
Once a criminal conviction is final, a defendant seeking federal habeas relief is stuck with the constitutional law that existed on the day finality attached. Federal habeas corpus is the mechanism state prisoners use under 28 U.S.C. § 2254, and federal prisoners under 28 U.S.C. § 2255, to challenge the legality of their detention in federal court. If the constitutional protection a petitioner wants to invoke was announced after that finality date, the claim fails regardless of how strong it would be under current law.
The Court gave two reasons. The first is finality: criminal judgments have to stay settled, or litigation never ends. The second is comity, the respect federal courts owe state courts and their processes. Federal habeas already involves a federal judge second-guessing a state court’s work, and letting every new Supreme Court decision reopen old state convictions would compound that intrusion.
When Your Conviction Became Final
The finality date matters enormously because it fixes the body of law you can draw on. A conviction becomes final when direct appeals are exhausted or the time to pursue them runs out. Three scenarios cover most cases:
- If you petition the U.S. Supreme Court for certiorari and the Court denies review, the conviction becomes final on the date of that denial.
- If you do not petition the Supreme Court, the conviction becomes final when the 90-day filing window closes after the lower appellate court enters judgment.
- If the Supreme Court grants certiorari and affirms, finality attaches on the date of that decision.
The 90-day deadline comes from Supreme Court Rule 13, which gives defendants that window after a state court of last resort or federal appellate court enters judgment to file a certiorari petition.1Supreme Court of the United States. Rules of the Supreme Court of the United States – Section: Rule 13 The math can be brutal. A petitioner whose conviction became final one day before a favorable Supreme Court decision is barred from using it; one whose conviction became final one day after can invoke it.
What Makes a Rule “New”
The threshold question in any Teague analysis is whether the rule the petitioner wants to invoke counts as new. The Court defined the category broadly: a rule is new if it “breaks new ground or imposes a new obligation on the States or the Federal Government,” or if the result “was not dictated by precedent existing at the time the defendant’s conviction became final.”2Justia U.S. Supreme Court Center. Teague v. Lane The operative word is “dictated.” If reasonable judges could have disagreed about the outcome at the time, the rule is new — even if most judges would probably have reached the same result.
An old rule, by contrast, is one where prior precedent so plainly controlled the outcome that no reasonable judge could have decided otherwise. Old rules are treated as straightforward applications of settled law and remain available on collateral review. In practice, courts have spent decades arguing about whether particular decisions were dictated by prior law or represented a genuine break.
The Court later split new rules into two categories that receive very different treatment. A substantive rule changes what conduct the law can punish or which people can receive a particular punishment. A procedural rule changes how courts determine guilt or impose a sentence.3Justia U.S. Supreme Court Center. Schriro v. Summerlin New procedural rules are categorically barred from retroactive application on federal habeas review. New substantive rules are the one thing that still gets through.
The Substantive-Rule Exception That Still Works
The surviving exception covers rules that place “certain kinds of primary, private individual conduct beyond the power of the criminal law-making authority to proscribe.”4Library of Congress. Teague v. Lane, 489 U.S. 288 (1989) Put plainly: if the Constitution forbids criminalizing certain conduct, or forbids imposing a particular punishment on a category of people, that rule reaches everyone, including people whose convictions are already final. The logic is that no one should stay in prison for conduct the government had no constitutional power to punish, or under a sentence the government had no power to impose.
Two decisions show the exception in action:
- In Montgomery v. Louisiana (2016), the Court held that Miller v. Alabama, which prohibited mandatory life-without-parole sentences for juvenile offenders, was a substantive rule requiring retroactive application. Miller effectively barred a particular penalty for a class of people based on their status as juveniles, so it reached back to older cases.5Justia U.S. Supreme Court Center. Montgomery v. Louisiana
- In Welch v. United States (2016), the Court ruled that Johnson v. United States, which struck down the Armed Career Criminal Act’s residual clause as unconstitutionally vague, was also substantive. By narrowing who could be subjected to the Act’s mandatory minimum, Johnson qualified for retroactive application.6Justia U.S. Supreme Court Center. Welch v. United States
This is the only functioning pathway for a federal habeas petitioner to benefit from a constitutional rule announced after their conviction became final.
The Watershed Procedural Exception Is Gone
The original Teague opinion recognized a second exception for “watershed rules of criminal procedure,” meaning procedural changes so fundamental that they altered the basic understanding of what a fair trial requires. The Court described these as rules “implicit in the concept of ordered liberty” and pointed to the right to appointed counsel for indigent defendants, recognized in Gideon v. Wainwright, as the kind of rule that would qualify.4Library of Congress. Teague v. Lane, 489 U.S. 288 (1989)
Over the next three decades, the Court never once found a rule that cleared the bar. Every procedural rule tested against the exception failed. In Edwards v. Vannoy (2021), the Court made that reality official. Writing for the majority, Justice Kavanaugh declared that “the watershed exception is moribund” and that continuing to articulate a theoretical exception that never applies “offers false hope to defendants, distorts the law, misleads judges, and wastes the resources of defense counsel, prosecutors, and courts.”7Justia U.S. Supreme Court Center. Edwards v. Vannoy The case involved whether Ramos v. Louisiana, which required unanimous jury verdicts for serious crimes, would apply retroactively. The Court said no and eliminated the watershed exception entirely. New procedural rules do not apply retroactively on federal collateral review, full stop.
How AEDPA Stacks on Top
Congress reinforced Teague when it passed the Antiterrorism and Effective Death Penalty Act (AEDPA) in 1996. Under AEDPA, a federal court cannot grant habeas relief on a claim already decided on the merits by a state court unless the state court’s decision was “contrary to, or involved an unreasonable application of, clearly established Federal law, as determined by the Supreme Court of the United States.”8Office of the Law Revision Counsel. 28 USC 2254 – State Custody; Remedies in Federal Courts
The phrase “clearly established Federal law” echoes Teague. A state court cannot have unreasonably applied a rule that did not exist yet. The result is a double barrier: Teague blocks retroactive application of new rules, and AEDPA demands deference to state courts’ reasonable applications of the rules that were in place.
State Courts Are Not Bound by Teague
One point often missed: the Teague framework binds only federal courts. In Danforth v. Minnesota (2008), the Supreme Court held that Teague “does not in any way limit the authority of a state court, when reviewing its own state criminal convictions, to provide a remedy for a violation that is deemed ‘nonretroactive’ under Teague.”9Justia U.S. Supreme Court Center. Danforth v. Minnesota
The reasoning is that Teague interpreted the federal habeas statute and balanced federal-state relations; it was never meant to dictate what relief state courts could provide under their own authority. A state court reviewing one of its own convictions is free to apply a new constitutional rule retroactively if its own precedent or state law allows. Some states have used that freedom; others have voluntarily adopted the Teague standard for their own post-conviction proceedings. For a defendant whose federal habeas claim is blocked, state post-conviction review may still be open, but the answer depends on the law of the state where the conviction occurred.