
California has some of the strictest knife laws in the US, and several cities and counties have even stricter local knife laws. While it is legal to buy, own, transport, and carry unrestricted knives in California, certain knives are illegal to carry, especially if they are misleading or undetectable. Plastic knives, for example, are considered push weapons and may be classified as concealed weapons. California law prohibits the manufacture or importation of undetectable knives, and any knife that is not detectable by a metal detector is illegal to manufacture, import, or sell. The state also has specific restrictions on carrying knives into public buildings, properties owned by the US government, and schools.
| Characteristics | Values |
|---|---|
| Plastic knives illegal in California | No specific mention, but any knife that is not detectable by a metal detector is illegal to manufacture, import, or sell |
| Knife laws in California | Some of the strictest in the US, with several cities and counties having even stricter local knife laws |
| Examples of knife restrictions in California | Los Angeles prohibits carrying in public any knife with a blade longer than 3 inches; Oakland has a similar ban; Sacramento County prohibits knives on any county property; San Diego County bans the possession of "throwing knives" at county parks; San Francisco bans loitering while carrying concealed knives with a blade longer than 3 inches |
| Legal knives in California | Gravity knives, butterfly knives, and folding knives (provided they are in a folded or closed position and not extended and locked into position) |
| Illegal knives in California | Air gauge knife, ballistic knife, belt buckle knife (if the blade is 2.5" or longer), cane sword, switchblades (with blades longer than 2"), dirks and daggers (if concealed), knives with blades longer than 3" in certain cities/counties |
| Penalties for violating knife laws in California | Misdemeanor or felony charges, resulting in 1-3 years in county jail or state prison |
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What You'll Learn
- Plastic knives are not explicitly outlawed in California
- However, knives that are illegal are those commonly used in crimes and have no obvious use as a tool
- California knife laws are among the strictest in the US
- Many counties and municipalities have knife ordinances that are more restrictive than state laws
- Carrying a knife as a weapon may result in additional jail time

Plastic knives are not explicitly outlawed in California
California law prohibits the possession, manufacture, or importation of undetectable knives, which are knives that cannot be detected by a metal detector. This law is likely to include plastic knives, as they would not be detectable by a metal detector. However, it is important to note that simple possession of these knives may not be specifically mentioned as illegal.
Additionally, California has various local knife laws that differ across cities and counties. For example, Los Angeles prohibits openly carrying any knife with a blade longer than 3 inches in public, while Oakland has a similar ban for knives with blades of 3 inches or longer. Sacramento County prohibits knives on any county property, and San Diego County bans the possession of "throwing knives" at county parks.
It is important to note that the context of knife possession and use can also be a factor in determining legality. For instance, hunters, construction workers, cooks, and gardeners may have relaxed knife restrictions as knives are considered "tools of the trade" for them.
While plastic knives may not be specifically outlawed in California, it is essential to adhere to the state's strict knife laws and local ordinances to avoid legal consequences.
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However, knives that are illegal are those commonly used in crimes and have no obvious use as a tool
California has some of the strictest knife laws in the US, and several cities and counties have even stricter local knife laws. While there is a California law regarding plastic knives, it is not in the same part of the Penal Code as other knife laws. The manufacture or importation of undetectable knives is illegal in the state. Any knife that is not detectable by a metal detector is illegal to manufacture, import, or sell. However, simple possession of such a knife is not mentioned as illegal.
In California, certain knives are illegal to carry, particularly if they are misleading or undetectable. Knives that are illegal to possess in California include the air gauge knife, ballistic knife, belt buckle knife, cane sword, and switchblade. Generally, knives that are illegal are those commonly used in crimes and have no obvious use as a tool. For example, knives that are disguised as everyday items such as combs, lipstick, or tire pressure gauges are illegal.
Some knives, such as dirks and daggers, may be carried openly in a sheath worn on the waist but may not be carried in a briefcase, purse, or other container. In addition, there are restrictions on carrying knives into public buildings, properties owned by the US government, and schools. Local ordinances may also impose stricter restrictions, such as Oakland's ban on carrying knives with blades longer than 3 inches. Hunters, construction workers, cooks, gardeners, and other people for whom knives are “tools of the trade” may have relaxed knife restrictions.
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California knife laws are among the strictest in the US
California's knife laws are considered among the strictest in the US. The state's laws regarding knives can be confusing and inconsistent, and there are two important factors to consider: whether the type of knife is legal or restricted, and the open carry law.
Firstly, it is important to understand the different types of knives and their legal status. The three most common types of knives—switchblades, folding knives, and fixed-blade knives (dirks and daggers)—have certain rules surrounding them. Switchblades are knives that have a blade contained within the handle, which is opened automatically by a spring when a button or switch on the handle is pushed. Under California law, it is unlawful to carry a switchblade with a blade longer than two inches. Additionally, any knife with a blade longer than four inches, fixed or capable of being fixed in an unguarded position, is restricted in state or local public buildings, meetings, airports, and passenger vessel terminals. "Box cutters" are also prohibited in airports and passenger vessel terminals.
The words "dirk" and "dagger" are legally defined as a knife or instrument with or without a handguard that is capable of ready use as a stabbing weapon and may inflict great bodily injury or death. These knives can be carried openly and must be in a sheath worn on the waist, not concealed in a briefcase, purse, or other container. The open carry law states that the hilt or handle of a knife cannot be hidden, even by clothing or the knife's sheath, to prevent surprise attacks. However, there is no allowable maximum blade length limitation under California law.
Furthermore, there are specific restrictions on carrying knives into public buildings, properties owned by the US government, and schools. Certain knives are illegal to possess in these locations, and doing so may result in a misdemeanor or felony charge and potential jail time. Additionally, any knife that is not detectable by a metal detector is illegal to manufacture, import, or sell in California.
It is important to note that carrying a knife or weapon of any kind increases the likelihood of unpleasant encounters with law enforcement. Even if a law hasn't been broken, the hassle and cost of dealing with a weapons-related arrest can be significant.
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Many counties and municipalities have knife ordinances that are more restrictive than state laws
California knife laws are among the strictest in the US. The state has stringent open-carry and conceal-carry laws. While California law does not explicitly mention plastic knives, it does prohibit the possession, manufacturing, and sale of certain knives, including undetectable knives, which are defined as knives that cannot be detected by a metal detector.
California Penal Code 17235 permits the open and concealed carry of folding knives, provided they are in a folded or closed position. However, if a folding knife is extended and locked into position, it becomes a "dirk" or "dagger," which has different, more restrictive rules. Carrying a concealed fixed-blade knife is a wobbler in California, meaning it can be charged as either a misdemeanour or a felony.
Additionally, several cities and counties in California have even stricter local knife laws. For example, San Diego County bans the possession of "throwing knives" in county parks, while San Francisco bans loitering while carrying concealed knives with a blade longer than three inches. Many counties and municipalities have knife ordinances that are more restrictive than state laws. These local ordinances can vary significantly, so it is essential to check the specific regulations in each county or municipality. Hunters, construction workers, cooks, gardeners, and other professionals who use knives as "tools of the trade" may have relaxed knife restrictions, but they must still follow the same laws as everyone else when they are not "on the job."
It is worth noting that the legality of knife possession and carry can vary not only between states but also between counties and municipalities within a state. This complexity in knife laws highlights the importance of individuals educating themselves on the specific regulations in their respective areas. Knife-related laws are frequently found in weapons statutes, and certain knives, based on their type of mechanism, blade length, or other factors, may be classified as weapons. While some states may have more relaxed knife laws, others have stricter regulations, and it is essential to abide by the laws and ordinances specific to your location.
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Carrying a knife as a weapon may result in additional jail time
California's knife laws can be confusing and sometimes inconsistent. The state's laws do not specifically mention plastic knives, but they do address knives in general and some knives that are typically made of plastic. It is important to understand these laws to avoid the consequences of a weapons charge. Carrying a knife as a weapon may result in additional jail time.
California law defines "dirk" and "dagger" as knives capable of being readily used as stabbing weapons that may inflict great bodily injury or death. This definition includes fixed-blade knives, such as kitchen knives, and ice picks. These knives must be carried openly in a sheath at the waist and cannot be concealed, even by the knife's sheath or clothing. The open carry law aims to prevent surprise attacks by ensuring the knife is visible to those around the carrier.
While dirks and daggers may be carried openly under California state law, the City of Los Angeles has imposed significant carry restrictions. It is essential to be aware of local ordinances, as they may differ from state-level laws. Additionally, certain knives are restricted in state or local public buildings, airports, passenger vessel terminals, and schools. These restrictions aim to enhance safety in public spaces.
California law prohibits the manufacture, importation, or sale of knives that are not detectable by metal detectors. These undetectable knives are often made of plastic or ceramic. The law does not mention simple possession as illegal, but carrying any knife as a weapon can increase the likelihood of unpleasant encounters with law enforcement and may lead to arrests and legal consequences.
It is important to note that context plays a crucial role in knife-related charges. While certain exemptions exist for lawful use, carrying a knife as a weapon in California may result in additional jail time. The specific penalties for knife-related crimes vary and should be carefully researched or discussed with a legal professional.
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Frequently asked questions
Plastic knives are not specifically mentioned in California knife laws. However, any knife that is not detectable by a metal detector is illegal to manufacture, import, or sell.
Yes, certain knives are illegal to own, carry, or possess in California, especially if they are misleading or undetectable. These include switchblades, ballistic knives, cane swords, and air gauge knives, among others.
Yes, there are restrictions on carrying knives in public, and these vary across different cities and counties in California. For example, Los Angeles prohibits carrying knives with blades longer than 3 inches in public, while Oakland has a similar ban for blades of 3 inches or longer.
Yes, there are specific restrictions on carrying knives into public buildings, properties owned by the US government, and schools. For example, Sacramento County prohibits knives on any county property, and San Diego County bans the possession of "throwing knives" at county parks.
Yes, there are several possible defenses, including unlawful search and seizure, the knife being legal, and self-defense. Additionally, hunters, construction workers, cooks, and gardeners may have relaxed knife restrictions as knives are considered "tools of the trade" for them.










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