Are you wondering whether it’s legal to own, carry, and keep a knife in Pennsylvania? If so, then you may be surprised to know that the state has knife laws that protect ownership. Yes, in Pennsylvania, it is legal to own a knife.
Be that as it may, the legality of knife ownership comes with several caveats. And, it is in these legal gray areas where knife owners have found themselves at the receiving end of arrests and confiscations.
Owning a knife may not be illegal in Pennsylvania, but if you’re a knife enthusiast or an avid hunter, you need to know more about the state’s knife laws. In doing so, you will also have a better idea of when to seek a Pittsburgh criminal defense lawyer.
The short answer: Pennsylvania has no blade length limit in state law, and most folding and fixed-blade knives are legal to own and carry. What matters is what a knife is designed for and why you are carrying it:
- Purpose over size. Under 18 Pa.C.S. § 908, Pennsylvania’s statute on prohibited offensive weapons, a knife is illegal only if it is made to inflict serious bodily injury and serves no common lawful purpose.
- Intent matters. Carrying any knife with the intent to use it in a crime can be charged as possessing instruments of crime, whatever the type of knife.
- Switchblades and automatic knives have been legal since January 2023. Pennsylvania removed them from the offensive weapons definition, so an automatic opening mechanism no longer makes a knife illegal under state law.
- Some places have their own rules. Knives are banned on school grounds and in court facilities, and some cities, Philadelphia among them, have local ordinances that go further than state law.
Read on to learn more about Pennsylvania’s knife laws.
What Size Knife Is Legal to Carry in Pennsylvania?
Pennsylvania does not have a specific blade-length limit written into state statute that automatically makes knives illegal based on size alone. Instead, the legality of knife carry in Pennsylvania depends primarily on the knife’s design, intended purpose, and the circumstances under which it is carried.
The key legal distinction lies in the classification of “prohibited offensive weapons” under 18 Pa.C.S. § 908. A knife becomes illegal based on its design and purpose, not its blade length. Since Pennsylvania removed switchblades and other automatic knives from the offensive weapons definition in January 2023, an automatic opening mechanism no longer makes a knife illegal. Ordinary pocket knives, hunting knives, and kitchen knives are generally legal to own and carry if they serve a lawful purpose.
However, context matters significantly in Pennsylvania knife law. Carrying a large knife in a manner that suggests criminal intent, or in prohibited locations like schools and courthouses, can lead to criminal charges regardless of blade size. Philadelphia has enacted stricter local ordinances that may impose blade-length restrictions beyond state law. Local municipalities across Pennsylvania may also impose their own regulations, so check the rules where you live and where you travel.
The safest approach is to understand that Pennsylvania’s knife laws focus on intent, lawful use, and location rather than a simple measurement. If you face questions about knife legality in your area, consulting with a criminal defense attorney can protect your rights.
Knives as Defined by Pennsylvania’s Laws
Title 18 of the Consolidated Statutes of Pennsylvania outlines the laws on the possession of illegal weapons. Section 908 contains the typology of weapons and the exceptions for the ownership and use of some.
According to Section 908, certain weapons have an illegal status based on the intention and purpose behind their possession. More specifically, the section classifies offensive weapons based on their capacity to “inflict serious bodily injury.”
Knives, in their potential to cause bodily harm, have been considered among many of the listed illegal weapons in the state, alongside:
- Firearms
- Homemade blades
- Razors
- Tasers
- Explosives
A knife’s potential to cause physical harm is not enough on its own. For a knife to count as an offensive weapon under Section 908, it must be an implement for the infliction of serious bodily injury that serves no common lawful purpose.
The statute once listed a second category: any knife with a blade that opens automatically by switch, push button, or spring. That language has been removed. Pennsylvania took switchblades and other automatic knives out of the offensive weapons definition, so an automatic opening mechanism no longer makes a knife illegal under state law. A switchblade, a hunting knife, and a pocket knife are now treated the same way: legal when there is a lawful purpose for having them.
Any knife owner can possess a knife so long as they have a lawful purpose for having it. Section 908 also contains its own exceptions, and there are other defenses to a knife charge.
Exceptions and Defenses
Law enforcement authorities in Pennsylvania can confiscate a knife or arrest its owner if an unlawful cause is suspected. An arrest is not a conviction. Section 908 builds in its own exceptions, and several general defenses apply to knife charges.
The curio exception. Section 908(b)(1) makes it a defense to show that you possessed the weapon solely as a curio (a collector’s piece) or in a dramatic performance, that you had it only briefly after finding it or taking it from an aggressor, or under similar circumstances that show no intent or likelihood that it would be used unlawfully.
General defenses. Beyond the curio exception, the defenses our attorneys raise most often in knife cases are:
- Lawful purpose. You had the knife for an ordinary reason, and the facts support it.
- No intent to use it unlawfully. A charge of possessing instruments of crime requires proof that you intended to use the knife to commit a crime. Without that intent, the charge fails.
- Unlawful search. If police found the knife during a stop or search that violated your rights, we can move to suppress it, and a case without its evidence often cannot go forward.
- The item is not an offensive weapon. A knife with a common lawful purpose does not meet the definition in Section 908.
There are other defenses or reasons for having a knife. Whatever the reason or circumstances are, the explanation and evidence should point towards the absence of unlawful intent or use.
To illustrate, you and your attorney can argue that the knife was just purchased and will be used for a woodworking project. Granted that there is sufficient evidence to prove this, you may be exonerated from the charges of illegal possession of a knife.
Common lawful purposes for having a knife can include the following:
- Hunting
- Fishing
- Kitchen use
- Woodwork within one’s residence
There are other situations in which having a knife can be considered lawful. The main idea is that the knife must suit a purpose for which you would need it.
Is It Legal to Carry a Knife Everywhere?
While owning a knife is not illegal, there are limits set on its usage. There are also limits on where you can carry a knife.
As mentioned earlier, an important condition to the legality of carrying a knife is the common lawful use.
Hence, when a person is seen in possession of a knife, the lawful possession will be determined based on the reason the person has. In other words, a person with a knife would need to explain why they have a knife in a specific place.
Let us compare two scenarios.
Person A was seen leaving a hardware store with a knife he just purchased. Person A was asked by the authorities about why he had a knife. After presenting a receipt for the purchase of the knife, person A explained that he was walking home to use it on a house project.
On the other hand, person B was seen in possession of a knife near a public school. When asked about the knife, person B gave an explanation but seemed anxious and stuttered.
In the case of person A, carrying a knife can be deemed legal since the purpose and evidence prove the absence of unlawful intent. Person B may be arrested for illegal possession of an offensive weapon as there was no proof of common lawful use.
In short, the limitations on carrying a knife are ultimately premised on the owner’s intent, explanation, and supporting evidence. There are, however, places where it is unconditionally illegal to carry a knife. According to the American Knife and Tool Association, these are:
- All primary and secondary schools (K-12)
- Court facilities
Is It Legal for People With Felonies To Own a Knife?
The answer to this question is “yes.” Pennsylvania makes no distinctions for people with felonies or warrants owning knives. Whether or not a person with a felony can carry one in public is a different matter altogether.
People with felonies are banned by law to carry knives in public places. The prohibition for this group also extends to other types of offensive weapons in the state like firearms.
If you or a loved one faces weapons charges in Pennsylvania, our experienced criminal defense team can help. Learn more about legal and illegal weapons in Pittsburgh to understand where knives fit into the broader weapons framework.
Frequently Asked Questions About Pennsylvania Knife Laws
Are switchblades legal in PA?
Yes. Automatic knives and switchblades have been legal in Pennsylvania since January 2, 2023, when HB 1929 took effect and removed them from the offensive weapons definition in 18 Pa.C.S. § 908. Some municipalities and local jurisdictions in Pennsylvania maintain their own restrictions on switchblades, so it is important to check local ordinances in your area before carrying one.
Yes, ordinary pocket knives are legal to carry in Pittsburgh and throughout Pennsylvania. Pittsburgh follows state law, which permits concealed carry of pocket knives for lawful purposes. The knife must have a lawful use (everyday utility, hunting, or work-related purposes are all common examples), and you must be able to explain your reason for carrying it if questioned by law enforcement.
Is it illegal to carry a knife in a school zone in PA?
Yes, carrying a knife in a school zone is illegal under Pennsylvania law. 18 Pa.C.S. § 912 prohibits weapons, including knives, on school property. This applies to all primary and secondary schools (K-12). Limited exceptions exist for authorized personnel such as law enforcement officers or security personnel acting in their official capacity, but ordinary citizens cannot carry knives on school grounds.
What knives are illegal in Pennsylvania?
Pennsylvania does not ban knives by type or blade length. Under 18 Pa.C.S. § 908, a knife is a prohibited offensive weapon only if it is made to inflict serious bodily injury and serves no common lawful purpose, and switchblades and other automatic knives are no longer on that list. Any knife carried with the intent to commit a crime can lead to a charge of possessing instruments of crime, regardless of the type.
Can you carry a knife for self-defense in PA?
You can carry a legal knife in Pennsylvania, and self-defense laws may apply if you use it to protect yourself from imminent harm. However, using a knife offensively, even in a self-defense situation, could result in assault or aggravated assault charges if the force used is deemed excessive or unreasonable. Pennsylvania’s Castle Doctrine and self-defense statutes may provide legal protection if you can demonstrate that your use of force was necessary, reasonable, and proportional to the threat you faced. Consulting with a criminal defense attorney about your specific situation is strongly recommended.
Can you carry a knife in your car in Pennsylvania?
Yes. State law does not treat a knife in a vehicle any differently from a knife in your pocket: an ordinary knife carried for a lawful purpose is legal, a prohibited offensive weapon under Section 908 is not, and carrying any knife with the intent to commit a crime is an offense wherever it happens. Local ordinances and the bans on school grounds and in court facilities still apply, so keep them in mind when you drive to those places.
Contact an Experienced Pennsylvania Knife Lawyer
Illegal possession of any weapon in the state is a criminal offense. If you have been caught with a knife, know that you have rights. One of them is calling a Pittsburgh criminal defense attorney.
Weapons charges in Pennsylvania can have serious consequences, including fines, probation, and incarceration. If you are facing weapons charges in Pittsburgh, our Pittsburgh firearms and weapons defense attorneys are ready to fight for your rights.
You need a Pittsburgh criminal defense lawyer who will be in your corner. Call Worgul, Sarna & Ness at (412) 281-2146 or send us a message to request a free consultation.
