Assault With a Dangerous Weapon in Massachusetts: Penalties and Defenses

Assault with a dangerous weapon in Massachusetts carries penalties of up to five years in state prison or up to two and a half years in a house of correction, plus a fine of up to $1,000, even when no one is physically touched.¹ The charge lives at Chapter 265, Section 15B. Penalties climb sharply when the victim is 60 or older, when the victim is a police officer who suffers serious injury, or when the case is charged instead as assault and battery with a dangerous weapon under Section 15A. And the courtroom sentence is only part of what a conviction costs.

Section 15B vs. Section 15A: Why the Charge Matters More Than Anything Else

Two neighboring statutes look almost identical on the page. The gap between them is the difference between a five-year and a ten-year maximum.

Section 15B covers assault with a dangerous weapon — a threat or an attempted use of force, with no requirement that the defendant actually touched the victim. A conviction carries up to five years in state prison, or up to two and a half years in a house of correction, and a fine of up to $1,000.¹

Section 15A covers assault and battery with a dangerous weapon — the same conduct plus actual harmful or offensive contact. That version carries up to ten years in state prison, or up to two and a half years in a house of correction, and a fine of up to $5,000.²

Whichever statute the prosecutor selects also decides whether the case moves on the felony track (state prison) or the misdemeanor track (house of correction). Prior record and the seriousness of the alleged conduct drive that choice.

What the Prosecution Has to Prove

For a Section 15B conviction, the state has to prove three things beyond a reasonable doubt:

The defendant did something that would put a reasonable person in fear of an immediate battery.
The defendant did it using an object capable of causing serious injury.
The defendant acted intentionally, not accidentally.

Two of those elements are where cases actually get won and lost. The “dangerous weapon” element often turns on how the object was used, and expert testimony sometimes gets called in when the object is unconventional. Intent tends to come down to circumstantial evidence: what the parties said, how they behaved before and during the incident, and what was recovered at the scene.

What Counts as a Dangerous Weapon

The category is much wider than most people assume. Firearms and knives qualify, but so do everyday objects when they are used in a way that could cause serious harm. Massachusetts courts have treated baseball bats, broken bottles, motor vehicles, and even a German shepherd dog as dangerous weapons.³

In Commonwealth v. Tarrant, the Supreme Judicial Court confirmed that the test is objective. It does not depend on how frightened the victim personally felt; it depends on whether a reasonable person would view the object as dangerous given how it was being wielded.³ A shoe, a chair, or a set of keys can qualify if the circumstances show it was capable of causing serious injury in the way it was used.

Enhanced Penalties for Elderly Victims

Section 15B(a) singles out assaults where the victim is 60 or older. The base maximum is the same — five years in state prison or two and a half years in a house of correction. But a second or subsequent conviction under this subsection carries a mandatory minimum of two years, with no eligibility for probation, parole, furlough, or work release until the first year has been served.¹ Prior convictions under Section 15A or under the armed-assault statute, Section 18, also count toward triggering the repeat-offender enhancement.

Enhanced Penalties for Police Officers and Public Employees

Assaults on public employees, including police officers and transit workers, are handled under a separate statute, Section 13D of Chapter 265. Basic assault and battery on a public employee carries 90 days to two and a half years in a house of correction, a fine between $500 and $5,000, or both.⁴

The stakes jump when the victim is a police officer and the assault causes serious bodily injury. The sentence in that scenario is one to ten years in state prison, or one to two and a half years in a house of correction, with a mandatory minimum of one year that cannot be suspended. A fine of $500 to $10,000 may be added but cannot substitute for the prison time.⁴ The mandatory minimum only kicks in when serious bodily injury actually results.

Probation, Fines, and Restitution

Judges often layer conditions on top of any incarceration. Standard Massachusetts probation includes regular check-ins with a probation officer, restrictions on leaving the state, and permission for home visits by probation staff.⁵ In weapons cases, courts frequently add anger management programming and a no-contact order barring any communication with the victim. Any probation violation can result in arrest and imposition of the original sentence.

Restitution to the victim, covering medical bills, counseling, and related costs, can be ordered on top of fines and jail time.

Firearms: A Conviction Ends Legal Gun Ownership

Because Section 15B carries a maximum of more than one year, a conviction triggers the federal firearm prohibition for anyone convicted of a crime punishable by imprisonment for more than one year.⁶ That is true regardless of what sentence the judge actually imposes.¹

Massachusetts adds its own layer. Assault with a dangerous weapon is a disqualifying offense for both a License to Carry and a Firearm Identification Card. A conviction, or even an admission to sufficient facts that ends in a continuance without a finding, works as a lifetime disqualifier for an LTC. Anyone who owns firearms at the time of conviction has to surrender or transfer them.

Immigration Consequences for Non-Citizens

This is the piece that most often turns a manageable criminal case into a life-altering one. Federal immigration law treats a “crime of violence” as an aggravated felony when the sentence imposed is one year or more, and that includes suspended sentences.⁷ A “crime of violence” is defined to include any offense involving the use, attempted use, or threatened use of physical force against another person.⁸ Assault with a dangerous weapon fits.

An aggravated felony makes a non-citizen deportable and blocks most forms of relief, including cancellation of removal, asylum, and Temporary Protected Status. It also permanently bars the “good moral character” finding required for naturalization, closing the door to U.S. citizenship.⁷ Even a sentence under a year can trigger deportation as a crime involving moral turpitude. A plea that reads as favorable on the criminal side can be catastrophic on the immigration side, so non-citizens need counsel who works across both.

The Criminal Record

A conviction lands on your Criminal Offender Record Information (CORI) file, accessible to Massachusetts law enforcement, many employers, and licensing agencies.⁹ A violent weapons offense on a background check creates real obstacles in licensed professions and in rental housing, since landlords use CORI to screen tenants.

Sealing is available on the standard Massachusetts timelines: most felonies seven years after the sentence is completed, most misdemeanors after three. Sealing hides the record from most background checks but does not destroy it. Expungement, which would erase the record entirely, is not available for this offense. Massachusetts law excludes any offense committed while armed with a dangerous weapon, any felony under Chapter 265, and any offense causing or intended to cause serious bodily injury from expungement eligibility.

Common Defenses

Self-defense is the most common argument, but it takes more than saying you felt threatened. Massachusetts requires a reasonable belief in imminent danger of bodily harm and a proportional response. If the other person had already backed off, the imminence piece falls apart. If your response went well beyond the threat, proportionality does.

Other defenses attack the state’s case element by element:

The object was not a dangerous weapon under the circumstances. A pen held at someone’s side is not the same as a pen driven at someone’s face.
There was no intent. If you tripped while carrying something heavy and a witness read that as a swing, the intent element fails.
Mistaken identity. In chaotic incidents with multiple people, witnesses often get the “who” wrong.

Procedural challenges can also gut the prosecution’s case. Evidence from an unlawful search, statements taken without proper Miranda warnings, or mishandled physical evidence can be excluded. Losing the weapon or the surveillance footage often leaves too little for the state to meet its burden.

1
General Court of Massachusetts. Massachusetts General Laws Chapter 265, Section 15b
2
General Court of Massachusetts. Massachusetts General Laws Chapter 265, Section 15A
3
Justia. Commonwealth v. Tarrant
4
Mass.gov. Massachusetts General Laws c.265 Section 13D
5
Mass.gov. Boston Municipal Court and District Court Order of Probation Conditions
6
Office of the Law Revision Counsel. 18 USC 922
7
USCIS. Permanent Bars to Good Moral Character
8
Office of the Law Revision Counsel. 18 USC 16
9
Mass.gov. 803 CMR 2.00 – Criminal Offender Record Information