Boston’s Criminal
Defense Lawyer
Defense Lawyer
Your Rights and Legal Concepts in a Massachusetts Criminal Case
Many Massachusetts criminal cases are not won on the ultimate question of what happened. They are won on the rules that govern how the case is investigated, what the police were allowed to do, what the Commonwealth is required to prove, and what the accused can be made to say. These are the rights and legal concepts that run underneath every charge, and understanding them is what separates a case that is managed from a case that is defended. This section explains the doctrines that most often decide the outcome of a Massachusetts criminal case, and links to a detailed page on each. Serpa Law Office has litigated these issues, motions to suppress, the right to silence, the burden of proof, and self-defense, in the District, Boston Municipal, and Superior Courts for thirty years.
For how outcomes like these are reached, from pretrial motions to trial verdicts, see dismissals, not guilty verdicts, and the alternatives to a guilty plea.
Understanding who controls a dismissal and when a judge can grant one is central to defending a Massachusetts charge.
The Rights and Doctrines That Decide Cases
A criminal charge is an accusation, not a conviction, and between the two stand a set of constitutional protections and common-law rules that the Commonwealth must satisfy at every step. Whether evidence was lawfully obtained, whether a statement can be used, whether the level of a charge is correct, and whether a justification like self-defense applies are not side issues; they are frequently the whole case. The pages below address each in turn.
Your Right to Remain Silent
The most valuable and most commonly surrendered right in any criminal case is the right to say nothing. It rests on the Fifth Amendment and Article 12 of the Massachusetts Declaration of Rights, and in Massachusetts it reaches pre-arrest silence, custodial silence, and the decision not to testify, with Commonwealth v. Molina, 476 Mass. 388 (2017), governing when silence may not be used against the accused. It matters most to the people who are most likely to be questioned before they think to ask for counsel: college students pulled into campus and police interviews, non-citizens whose words can surface in removal proceedings, and licensed professionals facing parallel board inquiries. The right is tested daily in the District and Boston Municipal Courts, where a statement made in a cruiser or an interview room becomes the Commonwealth’s central exhibit. Read more about your right to remain silent in Massachusetts.
Illegal Searches and Seizures
The Fourth Amendment and Article 14 of the Massachusetts Declaration of Rights protect against unlawful searches and seizures, and Article 14 affords broader protection than federal law in many settings, from automobile exit orders under Commonwealth v. Gonsalves, 429 Mass. 658 (1999), to the warrant rules for digital data. When police stop, search, or arrest unlawfully, the exclusionary rule requires suppression, and once evidence is suppressed it cannot be used at trial. The issue reaches everyone stopped in a car or on the street, but it decides the cases of people charged with drug offenses, firearms offenses, and OUI, where a successful motion to suppress in the Worcester, New Bedford, or Boston sessions frequently ends the prosecution. Read more about illegal searches and seizures.
Self-Defense in Massachusetts
Self-defense is a justification the Commonwealth must disprove beyond a reasonable doubt, not an excuse the defendant must prove. Commonwealth v. A Juvenile, 396 Mass. 108 (1985). Massachusetts law defines when force is reasonable (Commonwealth v. Franchino, 61 Mass. App. Ct. 367 (2004)), separates deadly from non-deadly force, imposes a duty to retreat outside the home with a narrow castle-law exception under G.L. c. 278, § 8A, and, through Commonwealth v. Adjutant, 443 Mass. 649 (2005), allows evidence of the alleged victim’s own prior violence to show who was the first aggressor. It is decisive in domestic violence and assault cases, and it extends to anyone charged after a fight they did not start, from household members to bar patrons to people defending another. These cases run through every District and Boston Municipal Court and, in homicide-adjacent matters, the Superior Court. Read more about self-defense in Massachusetts.
Felonies vs. Misdemeanors
Whether an offense is a felony or a misdemeanor determines which court hears it, the maximum exposure, and a cascade of collateral consequences, from firearm and voting rights to immigration status and employment. In Massachusetts a felony is any crime punishable by a state prison sentence and a misdemeanor is not, a line drawn by G.L. c. 274, § 1. The distinction governs venue, because the District and Boston Municipal Courts cannot try offenses carrying only a state prison sentence, and it falls hardest on non-citizens, for whom the felony line can track the federal categories that trigger removal, and on licensed professionals whose boards treat the two very differently. Read more about felonies versus misdemeanors.
Related Rights in the Digital and Post-Arrest Setting
Several of the rights that most affect modern cases arise in the first hours after police contact and in the search of digital devices. These are covered in depth in the blog and in adjacent practice pages:
The Fifth Amendment and Your Phone Passcode
When police seize a phone and demand the passcode, many people comply out of panic. Massachusetts follows Commonwealth v. Jones, 481 Mass. 540 (2019), which allows compelled entry of a passcode only where the Commonwealth already knows, to a virtual certainty, that the defendant knows it, a narrow but consequential standard. It affects everyone whose phone is seized, and especially students and non-citizens for whom the contents of a device can open an entirely new case. Read more about your Fifth Amendment right to refuse a passcode.
Digital Search Warrants
The search of a phone, computer, or cloud account is governed by warrant requirements Massachusetts courts apply with particular rigor, following Riley v. California, 573 U.S. 373 (2014), and the particularity limits of Commonwealth v. Snow, 486 Mass. 582 (2021). What police may seize, how broadly they may search, and what happens when they exceed the warrant are litigated across the drug, firearms, and sex-offense dockets. Read more about digital search warrants in Massachusetts.
What to Do in the First 24 Hours After an Arrest
An arrest sets off a sequence that moves faster than most people expect, and the decisions made in the first day, what to say, what to sign, whether to consent to a search, shape everything that follows. This is the moment the right to silence and the right to refuse a search either protect a person or are given away, and it matters most to first-time defendants who have never seen the inside of a police station. Read more about the first 24 hours after an arrest.
The Dangerousness Hearing (G.L. c. 276, § 58A)
In certain cases, including domestic violence, violent felonies, and some firearms matters, the prosecution can move under G.L. c. 276, § 58A to hold a defendant without bail for up to 120 days, a standard shaped by Commonwealth v. Barnes, 482 Mass. 636 (2019). It is frequently the first battle of a serious case, argued at arraignment in the District, Boston Municipal, and Superior Courts before the charge is ever tried. Read more about the dangerousness hearing.
How These Rights Fit Together in a Case
These doctrines do not operate in isolation. A traffic stop that violated Article 14 can suppress the evidence that produced a drug charge; a statement taken after the right to silence was ignored can be excluded; a self-defense justification the Commonwealth cannot disprove can end an assault case; and the felony-or-misdemeanor line can decide whether a case is heard in the District Court or the Superior Court and what it means for a non-citizen. Serpa Law Office examines every case against all of them from the first day, because the rule that ends a case is rarely the one the client came in worried about. For how these issues arise inside specific charges, see the Criminal Defense Practice Areas overview, the Criminal Process section, and the Criminal Records and Outcomes section.
If you have been charged or are under investigation, the rights described here are only as strong as your willingness to exercise them and the preparation behind them. Call Serpa Law Office at 617.936.0201 for a free and confidential consultation. Boston office: 20 Park Plaza #400A. Quincy office: 500 Victory Rd., Suite 400A. Available 24 hours a day.
Related Serpa Law Office Resources
We Accept the Following Payment Solutions
