California Penal Code 21310 makes it a crime to carry a concealed dirk or dagger on your person. It is a wobbler, which means prosecutors can file it as a misdemeanor punishable by up to a year in county jail or as a felony punishable by 16 months, two years, or three years in county jail.1California Legislative Information. California Penal Code 21310 The prosecution does not have to prove you intended to use the weapon or planned any other crime. Carrying a qualifying blade in a hidden manner is enough.
What the Law Prohibits
The statute is short. Anyone in California who carries a concealed dirk or dagger upon their person violates it.1California Legislative Information. California Penal Code 21310 The focus is on concealment. The same knife carried openly in a sheath hanging from your waist does not trigger the statute.
The law also cross-references exceptions starting at Penal Code 17700 for law enforcement officers, active military personnel, and other authorized individuals.1California Legislative Information. California Penal Code 21310
What Counts as a Dirk or Dagger
Penal Code 16470 defines a dirk or dagger as any knife or instrument, with or without a handguard, that is capable of ready use as a stabbing weapon and could inflict great bodily injury or death.2California Legislative Information. California Penal Code 16470 That definition is deliberately broad. It covers traditional daggers and combat knives, but it also sweeps in screwdrivers, ice picks, and sharpened pieces of metal if they could readily be used for stabbing. California sets no blade-length cutoff. The question is always whether the item can be readily used as a stabbing weapon.
Folding knives get special treatment. A nonlocking folding knife or pocketknife counts as a dirk or dagger only if the blade is exposed and locked into position.2California Legislative Information. California Penal Code 16470 A closed pocketknife in your pocket is not a violation. The same knife open and locked under your jacket is.
What “Concealed” Means
The weapon must be substantially concealed on your person. It does not have to be completely invisible. Partially hidden counts. A knife tucked into a waistband under a shirt, slipped inside a boot, or stashed in an inner jacket pocket all meet the threshold.
The important exception: a knife carried in a sheath worn openly and suspended from the waist is not considered concealed.3Justia. CALCRIM No. 2501 Carrying Concealed Explosive or Dirk or Dagger This is where people get into trouble. If the sheath is visible but the handle is tucked behind a long shirt or coat, a prosecutor can still argue the weapon was substantially concealed. The safest approach is keeping the entire sheath and handle visible at the waist.
What the Prosecution Has to Prove
Under CALCRIM 2501, the standard jury instruction, prosecutors must establish four elements beyond a reasonable doubt:
- You carried a dirk or dagger on your person.
- You knew you were carrying it.
- The weapon was substantially concealed on your person.
- You knew the item could readily be used as a stabbing weapon.
What catches people off guard is what is not on that list. The prosecution does not have to prove you intended to use the item as a weapon.3Justia. CALCRIM No. 2501 Carrying Concealed Explosive or Dirk or Dagger The charge can stick even if you were carrying the knife for a utility purpose, as long as it qualifies and was concealed.
Penalties
How the prosecutor files the case controls the sentencing range.
Misdemeanor
A misdemeanor conviction carries up to one year in county jail.1California Legislative Information. California Penal Code 21310 Judges often impose summary probation and fines instead of jail. It is the better outcome, but it still creates a criminal record that can affect employment and professional licensing.
Felony
A felony conviction carries a sentencing triad of 16 months, two years, or three years, served in county jail rather than state prison under California’s realignment framework in Penal Code 1170(h).4California Legislative Information. California Penal Code 1170(h) The court may impose formal probation with search conditions and a weapons prohibition. Fines can reach $10,000.
Which level the prosecutor picks depends on criminal history, the type of weapon, and whether other criminal activity was involved at the time of arrest.
Consequences Beyond the Sentence
A felony conviction under PC 21310 triggers a lifetime ban on owning or possessing firearms under both state and federal law.5California Department of Justice. Firearms Prohibiting Categories California Penal Code 29800 then makes it a separate felony for anyone with a prior felony conviction to possess a firearm.6California Legislative Information. California Penal Code 29800 A single conviction can therefore snowball into additional charges later.
A felony record also affects employment, professional licensing, housing applications, and jury service. For non-citizens, a felony weapons conviction can trigger deportability under federal immigration law, particularly if the offense is classified as a crime involving moral turpitude or an aggravated felony. Even without a standalone firearms ground for inadmissibility, a felony conviction can block immigration benefits depending on how it is categorized.
Common Defenses
Because the elements are narrow, most defenses attack one of the four prongs.
You Did Not Know the Item Was There
If you genuinely did not know the item was on your person, the knowledge element fails. This happens more often than people expect. Someone borrows a bag that has a knife inside. A passenger sits in a car where a weapon was left under the seat. Without proof you knew, the charge falls apart.
The Weapon Was Not Concealed
Open carry defeats the statute. The sheath-on-the-waist exception is the most common version of this argument.3Justia. CALCRIM No. 2501 Carrying Concealed Explosive or Dirk or Dagger Even without a sheath, a plainly visible weapon is not “substantially concealed.” These disputes are fact-specific and often turn on the arresting officer’s account.
The Item Is Not a Dirk or Dagger
Not every sharp object qualifies. A closed folding knife with the blade retracted does not.2California Legislative Information. California Penal Code 16470 Defense attorneys often challenge whether the object was actually capable of ready use as a stabbing weapon. A butter knife or small utility tool may not meet the threshold.
Illegal Search and Seizure
Police usually discover concealed weapons during traffic stops, pat-downs, or vehicle searches. If officers lacked probable cause for the stop or conducted the search without a warrant or valid exception, the defense can move to suppress the weapon as evidence. If the court finds the search unlawful, the weapon is excluded and the case typically collapses. Common issues include stops based only on presence in a “high-crime area,” frisks without reasonable suspicion that the person was armed, and vehicle searches without consent or probable cause.
Reducing or Clearing a Conviction
Because PC 21310 is a wobbler, someone convicted of the felony version can later petition under Penal Code 17(b) to reduce it to a misdemeanor. This is most viable for defendants who completed probation successfully and stayed out of trouble. A reduction restores firearms rights under California law, though federal restrictions may still apply, and it removes some of the collateral weight of a felony record.
After a reduction, or for those convicted of a misdemeanor from the start, California law allows a petition to dismiss the conviction under Penal Code 1203.4. A granted petition withdraws the guilty plea and dismisses the case. It does not erase the record entirely. The conviction still appears in law enforcement background checks, and certain licensing boards can still consider it. A dismissed conviction nonetheless carries far less weight than an active one and provides real relief for most employment purposes.