Michigan permits ownership of many ordinary knives, including automatic-opening knives, but it restricts concealed carry of named stabbing weapons and vehicle carry of those weapons. A separate statute criminalizes going armed with certain knives when there is intent to use them unlawfully against another person. [1] [2]
Michigan’s former automatic-pocketknife prohibition was repealed effective October 11, 2017. Current law should not be summarized as a general state ban on switchblades or automatic knives. [3]
Which knives may be owned?
Michigan does not impose a general possession ban on every manual folder, conventional fixed blade, or automatic knife. The compiler’s note for former § 750.226a confirms that the section concerning mechanically opened pocketknives was repealed in 2017. [3]
Ownership is not the same as unrestricted carry. A dagger, dirk, stiletto, double-edged nonfolding stabbing instrument, or another dangerous weapon can trigger the concealed-person and vehicle rules in § 750.227. [2]
What is the concealed-carry and vehicle rule?
Section 750.227 prohibits carrying a dagger, dirk, stiletto, double-edged nonfolding stabbing instrument of any length, or another dangerous weapon—except a hunting knife adapted and carried as such—concealed on or about the person. The statute also applies to those listed weapons in a vehicle operated or occupied by the person, whether concealed or otherwise. [2]
The statute contains exceptions for the person’s dwelling house, place of business, or other land possessed by the person. A violation is a felony punishable by up to five years’ imprisonment or a fine up to $2,500. [2]
Because the vehicle clause is broader than ordinary concealed-on-person language, placing a named stabbing weapon openly on a seat does not necessarily solve the problem.
Is three inches a general carry limit?
No. Section 750.226 prohibits going armed with a dagger, dirk, razor, stiletto, knife with a blade over three inches, or another dangerous or deadly weapon with intent to use it unlawfully against another person. The unlawful-intent element is part of the offense. [1]
That statute should not be converted into a general rule that every knife over three inches is illegal to own or carry. A different analysis may still apply under § 750.227 if the knife is a named stabbing weapon or another dangerous weapon carried concealed or in a vehicle.
What rules apply in a weapon-free school zone?
Section 750.237a increases penalties when a person engages in conduct already prohibited by listed weapons statutes—including §§ 750.226 and 750.227—in a weapon-free school zone. The zone includes school property and a vehicle used by a school to transport students. [4]
This is not accurately summarized as a blanket criminal ban on every small pocketknife in every school-related location. However, student discipline law and school policy can be broader. Michigan’s school code requires serious consequences for pupil possession of a “dangerous weapon” in a weapon-free school zone, subject to statutory exceptions and reinstatement procedures. [5]
Do not bring any knife to a school, school event, or school vehicle without clear written authorization.
What airport and local rules matter?
Michigan’s airport-security statute prohibits possessing or carrying a knife with a blade of any length in a sterile area of a commercial airport, subject to statutory exceptions. This is separate from federal TSA baggage rules. [6]
The Transportation Security Administration prohibits knives in carry-on baggage except plastic or round-bladed butter knives. Checked-baggage and airline requirements still apply. [8]
Local ordinances may add restrictions. Detroit, for example, defines specified weapons for city-public-building restrictions to include a dagger, dirk, knife, razor, or stiletto with a blade over three inches. Verify the current municipal code for the city you will enter. [7]
What should you verify before carrying?
- Whether the knife is a dagger, dirk, stiletto, double-edged nonfolding stabbing instrument, or another dangerous weapon.
- Whether it will be concealed on the person or carried anywhere in an occupied vehicle.
- Whether circumstances could support an allegation of unlawful intent under § 750.226.
- Whether the destination is a school zone, airport sterile area, city public building, employer, or private venue.
- Whether a local ordinance adds a blade-length or location rule.
Conclusion
Michigan no longer has its former automatic-knife possession ban, and three inches is not a universal carry limit. The central risks are the weapon’s design, concealed or vehicle carry under § 750.227, unlawful intent under § 750.226, and restricted locations.
Last reviewed: August 24, 2026.
This article provides general information, not legal advice. Michigan knife law can depend on design, intent, concealment, vehicle placement, location, local ordinances, and court interpretation. Verify current official sources or consult a qualified Michigan attorney about a specific situation.
Sources & References
- [1] Michigan Compiled Laws § 750.226. Knives and other weapons carried with unlawful intent.
- [2] Michigan Compiled Laws § 750.227. Concealed named weapons, vehicle carry, exceptions, and penalties.
- [3] Michigan Compiled Laws § 750.226a. Repeal of the former mechanically opened pocketknife prohibition.
- [4] Michigan Compiled Laws § 750.237a. Weapon-free-school-zone enhancements and definitions.
- [5] Michigan Compiled Laws § 380.1311. Pupil discipline for dangerous weapons in a weapon-free school zone.
- [6] Michigan Compiled Laws § 259.80f. Knives and other weapons in airport sterile areas.
- [7] Detroit Code of Ordinances, Chapter 38. Local public-building weapon restrictions and knife definition.
- [8] Transportation Security Administration — Knives. Federal carry-on and checked-baggage guidance.
