California’s discovery rule delays the criminal statute of limitations for certain concealed felonies, starting the clock when the crime is actually found out rather than when it was committed. The rule is codified in Penal Code 803(c) and applies to felonies built on fraud, breach of fiduciary duty, theft from elders or dependent adults, and misconduct by public officials.1California Legislative Information. California Penal Code 803 Once one of these crimes is discovered, prosecutors generally have four years to file charges under Penal Code 801.5.2California Legislative Information. California Penal Code 801.5 The exception exists because some offenses are designed to stay hidden, and anchoring the deadline to the date of the act would reward successful concealment.
For context, California’s default criminal deadlines are one year for misdemeanors, three years for standard felonies, and six years for felonies punishable by eight or more years in state prison, each measured from the date of the offense. The discovery rule rewrites that starting point for the narrow set of crimes it covers.
What “Discovery” Actually Means
Discovery has a specific legal meaning here, and it is not simply the day someone picks up the phone to call police. A crime is considered discovered when the victim or law enforcement actually learns of it, or when a reasonably diligent person in their position would have uncovered it.
That second prong matters. You cannot claim a crime went undiscovered if the warning signs were obvious and no one looked. Courts examine whether a reasonable person exercising ordinary care would have noticed something was wrong. A bookkeeper who sees unexplained shortfalls and does nothing can trigger the clock even if no one formally identified the theft at that moment. In fraud cases, judges often look at financial statements, audit reports, and internal communications to pinpoint when the irregularities became visible.
The Four-Year Filing Window After Discovery
Discovery does not give prosecutors unlimited time. Penal Code 801.5 gives them four years after the offense is discovered, or four years after the offense is completed, whichever date is later.2California Legislative Information. California Penal Code 801.5
This is where the rule often matters most in practice. A three-year felony like grand theft can easily be time-barred under the standard rule before anyone realizes the money is gone. The discovery rule resets that calculation: the four-year window starts fresh from the moment the crime surfaces, even if the underlying scheme ran for a decade.
Which Crimes the Rule Covers
Penal Code 803(c) limits the discovery rule to felonies that fall into one of four categories:1California Legislative Information. California Penal Code 803
- Felonies with fraud as a material element. The fraud must be a core ingredient, not incidental. This reaches schemes like insurance fraud, securities fraud, and financial document forgery.
- Felonies involving breach of a fiduciary duty, such as a financial advisor stealing from clients or a trustee diverting estate assets.
- Theft or embezzlement from an elder or dependent adult, recognizing that vulnerable adults are often targeted precisely because losses are less likely to be noticed or reported.
- Misconduct in office by a public official or employee, including bribery, falsification of public records, and conflicts of interest.
The statute lists specific offenses within these categories, including grand theft, forgery, bribery of public officials, welfare and Medi-Cal fraud, felony insurance fraud, and certain violations of the Business and Professions Code and Health and Safety Code. The list is non-exhaustive. It uses the phrase “including, but not limited to,” which lets courts apply the rule to other felonies sharing the same core characteristics.
Equally important is what the rule does not cover. The discovery rule does not apply to violent crimes, burglaries, drug offenses, or other felonies where the criminal act is immediately apparent. It is targeted at offenses that by their nature are concealed inside financial records, trust relationships, or bureaucratic processes.
Environmental Offenses Also Follow Discovery Timing
Penal Code 803(e) extends the same principle to certain environmental offenses, including violations of the Water Code and the hazardous waste provisions of the Health and Safety Code.1California Legislative Information. California Penal Code 803 Illegal dumping and contamination can go undetected for years, and tying the deadline to the date of the violation would effectively immunize polluters who hide their activities well.
For these environmental cases, the four-year window under 801.5 does not automatically apply. Instead, the standard limitation period for the underlying felony or misdemeanor runs from the date of discovery rather than from the date of the violation.
How Tolling Can Extend the Clock Further
Separate from the discovery rule, California law allows the statute of limitations to be “tolled,” meaning paused, in a few specific situations. Penal Code 803(a) is strict about this: limitation periods are not tolled or extended for any reason except where the statute expressly says so.1California Legislative Information. California Penal Code 803 Two provisions come up most often:
- Out-of-state absence. If a defendant leaves California after committing the crime, or was out of state when it occurred, up to three years of that absence does not count toward the limitation period. Someone who commits a felony and then moves to another state for two years effectively adds those two years to the prosecution deadline.
- Pending prosecution. Time spent prosecuting the same person for the same conduct in a California court does not count against the deadline. If charges are filed, dismissed on a technicality, and refiled, the first prosecution does not eat into the window.
Tolling stacks on top of the discovery rule. Consider a public official who embezzles government funds and goes undetected for years. Once the crime is discovered, the four-year clock begins under 801.5. If the official then flees to another state, the out-of-state tolling provision can pause that clock for up to three additional years.
Crimes With No Deadline at All
Some offenses sit outside the limitations system entirely. Under Penal Code 799(a), any crime punishable by death, life in prison (with or without the possibility of parole), or embezzlement of public money can be prosecuted at any time.3California Legislative Information. California Penal Code 799 This includes murder, treason, and kidnapping for ransom.
California has also eliminated the deadline for many felony sexual offenses, including forcible rape, lewd acts with a child involving substantial sexual conduct, and continuous sexual abuse of a child. Under Penal Code 799(b), these can be prosecuted at any time if the offense was committed on or after January 1, 2017, or if the previous limitation period had not yet expired as of that date.3California Legislative Information. California Penal Code 799 The discovery rule does not govern these cases. The legislature simply removed the deadline.
Raising the Defense in Court
The statute of limitations is not something a court polices on its own. A defendant or defense attorney must raise it, usually through a motion to dismiss. Judges generally will not throw out a case for being filed too late unless someone brings the issue forward. It is one of the first things a defense lawyer evaluates after charges are filed: when was the crime allegedly committed, when were charges brought, and does any tolling or discovery-rule exception apply?
When the prosecution relies on the discovery rule to justify a late filing, the timing question becomes intensely fact-specific. Courts look at precisely when law enforcement or the victim first had information that should have prompted an investigation, and whether a reasonable person would have connected the dots sooner.
One constitutional limit frames all of this. California cannot retroactively revive a prosecution that was already time-barred. If the old statute of limitations expired before a longer one was enacted, the new law cannot reopen the case. That would violate the Ex Post Facto Clause of the U.S. Constitution. The legislature can extend deadlines going forward, and it can apply longer periods to crimes where the old clock had not yet run out, but once the window has closed, it stays closed.