Yes, brass knuckles are illegal in Minnesota. Under Minnesota Statutes Section 609.66, subdivision 1(a)(4), it is a crime to possess, manufacture, or transfer metal knuckles, and the offense requires no proof that you meant to hurt anyone. Having a pair in your pocket, glove box, or dresser drawer is enough to be charged.1Minnesota Office of the Revisor of Statutes. Minnesota Statutes 609.66 – Dangerous Weapons
What the Statute Prohibits
The banned conduct is broader than most people expect. “Possess” is the obvious one. “Manufacture” means you can’t make a pair yourself, even as a metalworking project. “Transfer” covers giving, selling, or trading them. All three carry the same penalties.
Intent is not an element. Other parts of Section 609.66 require prosecutors to show you planned to use an item unlawfully as a weapon, but that requirement lives in subdivision 1(a)(5), which covers “other dangerous articles.” Metal knuckles sit in subdivision 1(a)(4), which has no intent element at all. If they’re yours, the offense is complete.1Minnesota Office of the Revisor of Statutes. Minnesota Statutes 609.66 – Dangerous Weapons
Penalties
Standard Misdemeanor
In most locations, a metal knuckles violation is a misdemeanor. The maximum penalty is 90 days in jail, a fine of up to $1,000, or both.1Minnesota Office of the Revisor of Statutes. Minnesota Statutes 609.66 – Dangerous Weapons
Gross Misdemeanor in School, Park, and Public Housing Zones
If the offense happens in a school zone, park zone, or public housing zone, the charge becomes a gross misdemeanor. That raises the exposure to 364 days in jail, a fine of up to $3,000, or both. The zones are defined by cross-reference to Section 152.01, Minnesota’s controlled substance definitions, which set geographic boundaries around schools, parks, and public housing developments.1Minnesota Office of the Revisor of Statutes. Minnesota Statutes 609.66 – Dangerous Weapons
There is one narrow carve-out. If the offense occurred on residential property inside one of those zones and you were an owner, tenant, or lawful guest of that residence, the standard misdemeanor penalty applies instead.1Minnesota Office of the Revisor of Statutes. Minnesota Statutes 609.66 – Dangerous Weapons
Using Brass Knuckles on Someone Is a Felony
The consequences change dramatically the moment brass knuckles come into contact with another person. Metal knuckles qualify as a “dangerous weapon” under Minnesota law, which covers any device designed as a weapon and capable of producing death or great bodily harm.2Justia Law. Minnesota Statutes 609.02 – Definitions Striking someone with them triggers assault in the second degree under Section 609.222, a felony carrying up to seven years in prison, a fine of up to $14,000, or both. If the victim suffers substantial bodily harm, the maximums rise to ten years and $20,000.3Justia Law. Minnesota Statutes 609.222 – Assault in the Second Degree
Self-Defense Is Not a Defense
This is where most people get the law wrong. Carrying brass knuckles for personal protection is not a permitted use in Minnesota. Section 609.66 criminalizes possession itself, with no exception for self-defense purposes. Carrying metal knuckles “just in case” is the offense.
If an officer finds a pair during a traffic stop and you explain that they’re for self-defense, you’ve confirmed possession. The reason you had them doesn’t matter under subdivision 1(a)(4).
What Counts as “Metal Knuckles”
The statute doesn’t define the term, and that creates some gray areas. Traditional brass knuckles clearly qualify, and so do versions made from steel, aluminum, titanium, or other metals. Items marketed as “paperweights” or “belt buckles” that are shaped to fit over a fist and deliver a punch will almost certainly be treated as metal knuckles no matter what the packaging says. Courts look at design and function, not the label.
Combination items sit in murkier territory. Knuckle-duster knives and tactical keychains with metal finger rings include a knuckle component, and prosecutors can be expected to charge under subdivision 1(a)(4). The safe assumption: if it’s metal and designed to be worn over the knuckles, it falls within the ban.
Realistic Defenses
Because intent is not an element, the defenses are narrower than for most weapons charges. A few real arguments exist depending on the facts.
- The item isn’t metal. The statute specifies “metal knuckles.” Knuckles made of plastic, carbon fiber, or other non-metal materials arguably fall outside subdivision 1(a)(4). Prosecutors may respond by charging under the broader “dangerous article” provision in subdivision 1(a)(5), but that provision requires proof of unlawful intent.
- No knowing possession. If someone else placed the item in your bag, car, or home without your knowledge, you may not have legally possessed it. This defense needs credible evidence that you genuinely didn’t know they were there.
- Unlawful search. If police found the knuckles during a search that violated your Fourth Amendment rights, a motion to suppress can eliminate the evidence and effectively end the prosecution.
Section 609.66 contains no exception for theatrical performances or historical reenactments. If a stage production needs a prop that looks like brass knuckles, a rubber or plastic replica avoids criminal liability.1Minnesota Office of the Revisor of Statutes. Minnesota Statutes 609.66 – Dangerous Weapons
Federal Buildings Add a Separate Offense
State law isn’t the only concern. Under 18 U.S.C. ยง 930, bringing any “dangerous weapon” into a federal building is a separate crime, and the statute’s definition comfortably covers metal knuckles. Bringing them into a federal building, such as a post office or Social Security office, is punishable by up to one year in prison. In a federal courthouse, the maximum is two years. If prosecutors can show you intended to use the weapon during a crime, the ceiling rises to five years.4Office of the Law Revision Counsel. 18 U.S. Code 930 – Possession of Firearms and Dangerous Weapons in Federal Facilities
What a Conviction Leaves Behind
Jail time and fines are only part of the picture. A weapons conviction on your record can affect employment prospects, professional licensing, and housing applications, and it will show up on standard background checks for years.
The knuckles themselves are gone as well. Minnesota law allows courts to order the seizure and destruction of prohibited weapons, so confiscated items are not returned even if the charge is reduced or dismissed through a plea.