Unlawful Purpose Weapons Attorney in New Brunswick, Middlesex County

Reviewed by William A. Proetta, Esq. · Updated October 2026

Possession of a weapon for an unlawful purpose, N.J.S.A. 2C:39-4, punishes having a weapon with the intent to use it unlawfully against another person or another’s property. With a firearm, it is a 2nd-degree crime carrying 5 to 10 years and a Graves Act parole bar; with a knife, bat or other non-firearm weapon it is 3rd degree (3 to 5 years), and with an imitation gun it is 4th degree.

The charge almost never travels alone. It is usually filed next to an aggravated assault, a threat or a robbery, and the whole complaint goes to the Middlesex County Prosecutor’s Office for screening, then to a grand jury and the Superior Court in New Brunswick. We defend these cases from our Edison office for people arrested in Woodbridge, Edison, Perth Amboy and across the county. In my experience the unlawful-purpose count is often the weakest part of the State’s case, because it asks a jury to read someone’s mind.

The Four Things the State Must Prove

The Supreme Court set out the elements of the firearm version in State v. Diaz, 144 N.J. 628 (1996). The State must prove beyond a reasonable doubt that:

1. The object was a firearm (or, under the other subsections, a weapon, explosive, destructive device or imitation firearm).
2. The defendant possessed it, actually or constructively, and knew it.
3. His purpose was to use it against the person or property of another.
4. That intended use was unlawful.

Purpose is the heart of the offense. The model jury charge tells jurors that the State does not have to prove why the person first got the weapon, but it must prove the specific unlawful purpose charged, and jurors may not rely on their own notions of some other, undescribed purpose. If the evidence suggests the person armed himself to protect himself or someone else, the State still carries the burden of proving an unlawful purpose beyond a reasonable doubt; the belief in the need for protection must be honestly held, though it need not be reasonable. A firearm remains a firearm for this offense even if it was unloaded or lacked a magazine, because N.J.S.A. 2C:39-1(r) defines a weapon that way.

Grades Under 2C:39-4, Most Serious First

A “community gun” is a firearm passed among two or more people who use it in crime or against others. For that count the statute itself requires a parole bar of one-half the sentence or three years, whichever is greater, and the Graves Act can push the floor to 42 months. The imitation-gun version is explained on our imitation firearm page.

None of these offenses is on the No Early Release Act list. The companion charge may be: robbery and the serious forms of aggravated assault carry the 85% rule at 1st or 2nd degree, which is why the robbery or aggravated assault count often drives the exposure more than the weapon count.

Sentencing Exposure and the Graves Act

For a 2C:39-4(a) firearm conviction, the Graves Act requires a parole bar of one-half the sentence or 42 months, whichever is greater. The only route below that floor is a waiver motion by the prosecutor under N.J.S.A. 2C:43-6.2, which can lead to probation or a one-year parole bar. Our Graves Act guide explains how the Attorney General’s guidance shapes those offers and how courts review a prosecutor’s refusal. The 2026 one-degree-lower sentencing law has not, in our practice, lowered the Graves minimum.

A knife or other-weapon conviction under 2C:39-4(d) carries no mandatory term. A first offender convicted at 3rd degree generally has the benefit of the presumption against imprisonment in N.J.S.A. 2C:44-1(e), and probation is a realistic sentence; that presumption does not apply if the judge finds certain aggravating factors, such as organized criminal activity or domestic violence committed in a child’s presence. Any conviction for a crime still disqualifies a person from a firearms card or permit under N.J.S.A. 2C:58-3(c)(1).

When a weapon is possessed during a drug offense, prosecutors may add N.J.S.A. 2C:39-4.1, which requires a consecutive sentence; our page on weapons during a drug offense covers it.

Immigration and expungement. A firearm conviction can create a separate ground for deportation, so a non-citizen should get immigration advice before any plea. Weapons offenses are not barred from expungement and follow the ordinary waiting periods.

When the Weapon Count Merges

Merger often decides whether a client serves one sentence or two. Under Diaz and State v. Parolin, 171 N.J. 223 (2002), when the only evidence of the unlawful purpose is the crime the person committed with the weapon, the possession count and that crime merge for sentencing. In Parolin, the defendant pointed a rifle at a woman and fired; the aggravated assault supplied the unlawful purpose, so the Court ordered the convictions merged. Merger does not follow when the State proves an unlawful purpose separate from the completed crime, such as a plan to use the gun against someone else. We raise merger at sentencing and use it in plea talks, because a count that will merge adds little real exposure.

How These Cases Unfold in Middlesex County

A typical file starts with a fight: a parking-lot argument in Sayreville, a dispute on a New Brunswick street, a confrontation at a home in Edison. Officers find a knife or a gun nearby and charge everything the facts could support. A firearm count usually brings a complaint-warrant and an overnight stay at the county jail in North Brunswick before a virtual first appearance. Section 2C:39-4(a) is excluded from the 2022 law requiring a no-release recommendation for most Graves firearm crimes, but where police describe an illegal street gun, prosecutors commonly move to detain and release becomes difficult.

During screening, the MCPO decides which counts go to the grand jury. A file built on a single witness’s account of “intent” can sometimes be resolved with an amended charge that is not on the Graves list, which removes the mandatory minimum. For a 2nd-degree count, Pretrial Intervention requires the prosecutor’s consent just to be considered, plus a guilty plea held inactive during the program; at 3rd degree, admission depends on the prosecutor’s recommendation. Either way, the application is due by the Initial Case Disposition Conference after arraignment, as our Middlesex PTI page explains.

Defending an Unlawful Purpose Charge

• Purpose. Carrying a weapon, even illegally, is not the same as intending to use it unlawfully. Where the facts support only possession, the right charge is unlawful possession, not 2C:39-4.
• Protective purpose. A person who armed himself because he honestly feared an attack did not have an unlawful purpose, and the burden on purpose stays with the State.
• Self-defense at home. State v. Montalvo, 229 N.J. 300 (2017), an unlawful-possession case, held that answering one’s own door holding a lawful weapon is not automatically a crime.
• Intoxication. Under N.J.S.A. 2C:2-8, intoxication can matter only if it negates purpose. The Supreme Court in State v. Cameron, 104 N.J. 42 (1986), required “such a great prostration of the faculties” that the mental state was totally lacking, so this defense fits only extreme cases.
• The search and the statements. If the weapon or an admission came from an unlawful stop, search or interrogation, a motion to suppress can remove it.

Talk to a Middlesex County Weapons Defense Lawyer

Avoid talking to police or the other people involved, and preserve any texts or video that show what led up to the incident. Call (732) 659-9600 any time to reach our Edison office, or contact us online for a free review.