What Is the Three Strikes Law and How Does It Work?

The three strikes law is a sentencing rule that punishes repeat felony offenders far more harshly than first-timers. In California, a defendant with one prior “strike” on their record has the sentence for any new felony doubled, and a defendant with two or more prior strikes faces a minimum of 25 years to life in state prison on a new qualifying felony.¹ A separate federal statute imposes mandatory life imprisonment on defendants convicted in federal court of a serious violent felony who already have two qualifying prior convictions. The crimes that count, the exceptions, and the ways a judge can step in have all changed significantly since the law was first passed, so the answer to “what sentence am I actually facing?” depends on details that are easy to miss.

What Counts as a Strike

California keeps two overlapping lists of qualifying prior convictions: violent felonies and serious felonies. A conviction on either list can serve as a strike.

The violent felony list covers murder, voluntary manslaughter, rape and other forcible sex offenses, robbery, kidnapping, carjacking, arson of an inhabited structure, and attempted murder. Any felony punishable by life in prison also qualifies, as does any felony in which the defendant personally inflicted great bodily injury or used a firearm, if that fact was charged and proven.²

The serious felony list is broader. It includes first-degree burglary, bank robbery, assault with a deadly weapon, personally using a firearm in any felony, and selling heroin, cocaine, PCP, or methamphetamine to a minor. Attempting any felony punishable by death or life imprisonment also counts.³ First-degree burglary makes the list because a break-in at an occupied home creates a serious risk of confrontation, even when no one is actually hurt.

Out-of-State and Federal Priors

A felony conviction from another state or from federal court can count as a strike if the elements of that offense match all the elements of a California violent or serious felony.¹ The court compares the legal definitions, not the underlying facts of what happened. If you have out-of-state felony priors, expect prosecutors to examine them carefully once a new California case is filed.

Juvenile Adjudications

A juvenile court finding can follow you into the adult system as a strike, but only when every one of these conditions is met: the juvenile was at least 16 at the time of the offense, the offense appears on the list in Welfare and Institutions Code Section 707(b), and the juvenile was adjudged a ward of the court.⁴ The 707(b) list is limited to the most serious juvenile offenses, including murder, arson, robbery, kidnapping, carjacking with a weapon, assault with a firearm, assault likely to produce great bodily injury, attempted murder, and voluntary manslaughter.⁵ Most property offenses and lower-level crimes committed as a juvenile will not count, even if they were felonies at the time.

No Washout Period

California does not let old strikes expire. A serious or violent felony conviction from thirty years ago counts the same as one from last year.⁶ Defendants with dated records often do not realize this until they are facing enhanced charges. The age of a prior can still matter when a judge decides whether to dismiss it, but it does not drop off on its own.

How a Second Strike Is Sentenced

With one prior strike, the court doubles whatever sentence the new crime would normally carry.¹ The new offense does not have to be serious or violent. Any felony triggers the doubling. A crime that would ordinarily carry a four-year mid-term sentence becomes an eight-year sentence for someone with a prior strike.

The doubled term replaces the usual sentencing range outright. A judge cannot pick a low-mid-high term and then add an enhancement on top. The doubled sentence becomes the new baseline, which is why second-strike exposure can be startlingly severe even for mid-level felonies.

How a Third Strike Is Sentenced

A defendant with two or more prior strikes who is convicted of a new qualifying felony faces a mandatory minimum of 25 years to life in state prison.¹ “25 to life” is literal: you serve at least 25 years before any parole hearing, and release at that point is not guaranteed. You remain under the jurisdiction of the state corrections system for life unless the parole board releases you.

Before 2012, the life sentence applied even when the triggering felony was something minor like petty theft with a prior. Proposition 36 in 2012 narrowed the rule so that the new felony generally has to be a serious or violent offense to trigger 25-to-life.⁷ Exceptions remain for current offenses involving certain sex crimes or weapons charges, and for defendants whose record includes homicide and similar offenses.¹

A different measure, also labeled Proposition 36, was approved by voters in 2024. That one deals with retail theft and drug penalties and does not change three strikes sentencing.

Resentencing for Old Third-Strike Life Terms

The 2012 Proposition 36 reform also opened a door for people already serving life sentences under the old version of the law. If you are serving a third-strike life term for a current offense that was not a serious or violent felony, you can petition the trial court that sentenced you for resentencing.⁸

If the court finds you eligible, it resentences you as a second-striker, which usually means a doubled term rather than life. The court can deny the petition if it concludes that resentencing would pose an unreasonable risk of danger to public safety.⁸ Prior sex offenses and homicide-related convictions disqualify a petitioner from relief altogether.

Good Conduct Credits

Three-strikers earn credits more slowly than most other inmates. The original statute capped good conduct credits at 20 percent of the total sentence, meaning roughly one day off for every four days served.¹ Subsequent reforms, including Proposition 57 in 2016 and later regulatory changes by the California Department of Corrections and Rehabilitation, raised those rates. Since May 2021, three-strikers convicted of violent felonies earn credits at 33.3 percent (one day of credit for every two days served), and those serving three-strikes sentences for non-violent offenses earn credits at 50 percent (one day of credit for every day served).⁹ The practical gap between a doubled sentence and a non-strike sentence is still significant.

Asking a Judge to Dismiss a Strike

Trial judges have the authority to dismiss a prior strike “in furtherance of justice” under Penal Code Section 1385. The California Supreme Court recognized that power in People v. Superior Court (Romero) in 1996, and defense attorneys now routinely file “Romero motions” asking the court to strike one or more priors so the defendant is sentenced as a first- or second-striker instead of facing life.¹⁰

When ruling on a Romero motion, the court weighs the defendant’s background and character, the nature of the current offense, the seriousness of the prior strikes, and the impact on public safety.¹⁰ A judge cannot dismiss a strike just because the resulting sentence seems harsh, or to reduce court congestion, or because the defendant pled guilty. The decision has to be grounded in specific facts about the case.

Amendments to Section 1385 added a list of mitigating circumstances that courts must weigh heavily in favor of dismissal. These include situations where the enhancement would push the sentence beyond 20 years, where the prior conviction is more than five years old, where the current offense is connected to mental illness or childhood trauma, or where the defendant was a juvenile when the triggering conduct occurred. If any of these apply, the court must dismiss the enhancement unless doing so would endanger public safety, defined as a likelihood of physical injury or other serious danger to others.¹¹ These provisions have given defense counsel considerably more leverage than existed in the law’s early years.

The Federal Three Strikes Law

Federal three strikes sentencing is a separate scheme that applies only to defendants convicted in federal court. Under 18 U.S.C. § 3559(c), a defendant convicted of a “serious violent felony” who has two or more prior convictions for serious violent felonies or serious drug offenses faces mandatory life imprisonment.¹² At least one qualifying prior must be a serious violent felony; the other can be a serious drug offense involving distribution or manufacturing of controlled substances.¹³

The federal definition of “serious violent felony” covers murder, manslaughter (other than involuntary), kidnapping, robbery, carjacking, arson, extortion, aggravated sexual abuse, and firearms offenses. It also includes any crime punishable by 10 or more years that involves the use or threat of physical force. Attempts, conspiracies, and solicitations to commit any of these also qualify, though an attempted robbery can be excluded if the defendant proves no weapon was used or threatened and no one was seriously injured.¹²

Two features set the federal statute apart from California’s. First, the federal law has a sequencing requirement: each qualifying prior (other than the first) must have been committed after the defendant was convicted of the preceding one, so two convictions arising from the same criminal episode do not stack. Second, there is no “second strike” doubling in federal court. The enhanced penalty is all or nothing, triggered only by a qualifying third conviction. The prosecutor must file written notice before trial identifying the priors it intends to rely on, giving the defense an opportunity to challenge them.¹³

Constitutional Challenges

Defendants have repeatedly argued that life sentences for relatively minor third offenses violate the Eighth Amendment’s ban on cruel and unusual punishment. The U.S. Supreme Court addressed the core question in Ewing v. California in 2003, holding that a 25-to-life sentence for a repeat offender was constitutional because the state has a legitimate interest in incapacitating people who repeatedly commit serious crimes. That ruling largely closed the door on broad proportionality challenges, though a defendant can still argue that specific individual circumstances make a particular sentence unconstitutional.⁶ In practice, most relief from a harsh three strikes sentence now comes through legislative reforms like Proposition 36 and through Romero motions, not through constitutional litigation.

1
California Legislative Information. California Penal Code 667
2
California Legislative Information. California Penal Code 667.5
3
California Legislative Information. California Penal Code 1192.7
4
California State Assembly. AB 1279 – Assembly Committee on Public Safety Analysis
5
California Legislative Information. California Welfare and Institutions Code 707
6
Legislative Analyst’s Office. A Primer – Three Strikes: The Impact After More Than a Decade
7
Legislative Analyst’s Office. Proposition 36 – Three Strikes Law. Sentencing for Repeat Felony Offenders
8
California Legislative Information. California Penal Code 1170.126
9
New York Codes, Rules and Regulations. California Code of Regulations Title 15 3043.2 – Good Conduct Credit
10
Supreme Court of California Opinion Archive. People v. Superior Court (Romero)
11
California Legislative Information. California Penal Code 1385
12
Office of the Law Revision Counsel. 18 USC 3559 – Sentencing Classification of Offenses
13
United States Department of Justice. Criminal Resource Manual 1032 – Sentencing Enhancement Three Strikes Law