Find Out Whether the Knife You Carry is Illegal

 Posted on May 16, 2026 in Weapons Charges

Guns are subject to many regulations, and gun laws are hotly debated. Therefore, with all the focus on guns, it is easy to forget that knives are subject to regulations, and in some cases, they are illegal. There are several reasons to lawfully carry a knife, and knife collecting itself is not illegal. They are useful tools in many people’s professions and hobbies, such as hunting. However, what one person may view as an eccentric or rare knife, the law may view as illegal.

It is important to determine if the knives you carry are illegal. If an officer sees you carrying an illegal knife or sees the knife in plain view in your car, the officer could use that as justification for a search of your body or car. If you’re facing a charge because of a knife you own or carried, contact our Wheaton, IL weapon charge defense lawyer at Davi Law Group, LLC. As a former prosecutor, Attorney Dion Davi can anticipate arguments from the state and present a defense tailored to your situation.

What Kinds of Knives Can You Legally Own in Illinois?

In Illinois, the following knives are legal to possess:

• Balisong or butterfly knives

• Disguised knives, such as cane knives, belt knives, and lipstick knives

• Throwing knives

• Bowie knives and other large knives

However, you should still be careful about going out in public with knives. Illinois law forbids anyone from possessing or storing a knife or dagger on public property with a blade measuring three inches or longer.

What Knives Are Illegal Under Illinois Law?

Illinois has banned knives with switchblades. Switchblades open automatically when a button, spring, or another mechanism on the knife’s handle is pressed. Illinois has also banned ballistic knives. Ballistic knives propel a knife blade as a projectile through the use of a spring, elastic band, or compressed gas. 

Any knife that is possessed with the intent to harm another or break a law is also illegal, even if the knife would be otherwise legal. Brass knuckles are also illegal in Illinois. 

There are certain exceptions to the state’s switchblade laws. Namely, you may be allowed to carry a switchblade as long as you have a valid Firearm Owner's Identification Card (FOID). Note that your FOID could get revoked if you are convicted of a felony or a domestic violence offense, among other violations. Anyone "engaged in the business of" selling or manufacturing switchblades is also generally considered exempt.

Penalties for Illegal Knife Possession in 2026

Simply possessing an illegal knife is typically considered to be a Class A misdemeanor, which is punishable by up to one year in jail and/or a fine of up to $2,500 (720 ILCS 5/24-1). There could be stiffer penalties if the knife was found in a protected place such as a school, public housing development, or a courthouse. Every case is different, and an experienced Illinois criminal lawyer will be able to give you individualized advice.

Charged With a Crime Over a Knife That Didn’t Belong to You?

A weapon charge can feel especially unfair if the knife in question was not yours. For example, police may find a knife in your car during a traffic stop. The knife may belong to a friend, a family member, or someone who borrowed the vehicle. Even then, prosecutors may still argue that you possessed it.

Possession does not always mean the knife was in your hand or pocket. Prosecutors may try to prove "constructive possession." This means they may claim you knew the knife was there and had control over the area where it was found. A knife in the glove box, center console, trunk, or under a seat can raise questions about who knew about it and who could reach it.

A strong defense may focus on the facts. Who owned the car? Who else had access to it? Was the knife hidden? Were there fingerprints, statements, or other evidence linking you to it? These details are critical, no matter how small or trifling they seem. Being near a knife is not always the same as knowingly possessing it.

How Your Fourth Amendment Rights Could Affect an Illegal Knife Case in Illinois

The Fourth Amendment protects people from unlawful searches and seizures. This can be very important in an Illinois knife case. If police found the knife during an illegal stop, search, or arrest, the evidence may be challenged.

For example, police usually need a valid reason to stop a vehicle. They also need legal grounds to search your car, backpack, home, or clothing. An officer’s hunch is not always enough. If police searched without consent, a warrant, probable cause, or a valid exception, the defense may ask the court to suppress the knife as evidence.

If the court agrees, prosecutors may not be able to use the knife against you. In some cases, that can weaken the case or lead to dismissal. The key issue is not only what the police found. The court may also look at how they found it.

Assessing Intent in Illinois Knife Crime Cases

Intent can play a major role in knife crime cases. Illinois law does not treat every knife the same way in every situation. As previously addressed, the type of knife, where it was found, and how it was being used can all matter.

Prosecutors may look for signs that a person planned to use the knife unlawfully. This could include threats, a fight, witness statements, text messages, or the way the knife was carried. But many people carry knives for lawful reasons. A person may use a knife for work, fishing, camping, opening boxes, or general utility.

The defense may challenge the idea that the knife was meant to be used as a weapon. Context is key. A knife in a toolbox can tell a different story than a knife pulled during an argument. The goal is to show the full picture, not just the most damaging version of events.

Contact a DuPage County, IL Weapons Charge Lawyer

If you have been charged with a crime in Illinois, you should exercise your right to competent counsel. You should not have any lingering questions about your criminal case. 

If you are interested in discussing your charges or situation with a Wheaton, IL criminal law attorney, contact Davi Law Group, LLC for a free consultation by calling 630-580-6373. We have several locations that serve clients in DuPage, Kane, Cook, Kendall, and Will Counties.