Criminal Defense Attorney Portsmouth NH

Charged With a Crime?

Your Next Decision Matters Most.

An arrest can put your license, your job, and your freedom on the line within days.

Wiberg Law Office is a criminal defense firm in Portsmouth NH led by attorney Sven Wiberg, who has spent 36 years defending people who were told to just plead and hope for the best.

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Sven Wiberg Attorney at Law

Sven Wiberg

ATTORNEY AT LAW

About Wiberg Law Office

Wiberg Law Office, PLLC is a Portsmouth civil rights law firm representing clients whose constitutional rights have been violated, whether through police misconduct and excessive force or unlawful arrest and discrimination, in New Hampshire and Massachusetts state and federal courts. Founding attorney Sven Wiberg has been licensed in both states since 1990 and began his career on the prosecution side, giving him firsthand insight into how law enforcement and government agencies build their case files, and where those cases are most vulnerable to challenge.

Attorney Wiberg is a member of the National Association of Criminal Defense Lawyers and the New Hampshire Association of Criminal Defense Lawyers, and he holds a Distinguished® rating from Martindale-Hubbell. Attorney Brian Stone, a U.S. Army veteran and former New Hampshire State Representative, brings that same trial-focused approach to civil rights litigation, holding police departments and government bodies accountable when they cross constitutional lines.

The firm is built around a simple idea: getting the best possible result for each client matters more than moving a high volume of cases. That’s why you’ll spend real time with your attorney, not ten minutes on the phone, and why you’ll hear an honest, experienced assessment of your civil rights claim rather than what you want to hear. Every client of Wiberg Law Office gets that same standard of representation, no matter how serious the violation or how powerful the agency on the other side.

How We Build Strong Criminal Defense Strategies

We prepare every case for trial.

Prosecutors negotiate differently when they know your attorney will pick a jury. We have taken cases to verdict that other lawyers would have pleaded out, including confession cases.

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We challenge the evidence, not just the charge.

The stop, the search, the breath test, the interrogation, and the lab work are all examined for constitutional violations and procedural errors.

We bring in the experts the case demands.

That has meant cross-examining physicians in a shaken-baby prosecution and retaining forensic and toxicology specialists. We use every resource available.

We lay out your legal and ethical options, and you choose.

You'll know the realistic outcomes at every stage and make the decisions about your own case with clear information.

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What Our Customers Say…

Ryan Ingram Avatar
Ryan Ingram
3/18/2026
Defiantly one of the best Law Firms in Rockingham County NH by far & will fight for you in court & go the extra mile for sure, I highly Recommend this Law firm too any of my Family & Friends!!!
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Rob L.
5/05/2025
If you want an amazing lawyer, this is the person you go to. Sven was able to defend me and win at trial, it was a totally amazing feeling to see the tears stop from my worried mothers' eyes. I am a law-abiding citizen but if the instance ever came up where I needed a lawyer again, Sven would be the person I would use hands down! Thank you so much.
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Therese
2/23/2024
My first contact with Sven was in 2007. He has represented me on 2 different cases. From the beginning, I had extreme confidence in him & I knew he was just the attorney I needed & to hire him. Although he made no promises to me, somehow I knew that he would represent me to the best of his ability & my case would end victoriously. He was/ is very professional, efficient & extremely knowledgeable in his field. He really knows his stuff. He conducted/conducts himself in an ethical & honest manner. He not only had/has high standards, he had/has integrity. Rest assured that once he takes your case, he will represent you with zeal, confidence, knowledge, honesty, integrity & lots of hard work. He will do the very best job he can for you, I guarantee it... Both of my cases looked bleak & hopeless due to the unusual circumstances that occurred, but the end result(s) ended victoriously. Although both cases took a long time for the end result, Sven worked hard & played the game(s) that frequently occurred/occurs in the judicial system arena with extreme professionalism, integrity, knowledge & patience, I would not hesitate to hire him again if I needed to. His fee(s) may be a little on the high side, or expensive, but he is well worth it. I would highly recommend Sven Wiberg to anyone who needs representation, as he is an exceptional attorney!!
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Criminal Defense Cases We Handle

DUI / DWI Defense

First-offense and repeat DUI, refusals, blood-test cases, and aggravated DUI involving high speed, a passenger under 16, or injury. We represent you in both the criminal case and the administrative license suspension hearing. CDL holders receive particular attention, since a refusal alone can end a driving career.

Drug Crimes

Possession, sale, manufacturing, and trafficking of controlled substances under New Hampshire's Controlled Drug Act, in state and federal court.

Domestic Violence

We handle both the criminal charge and the civil protective-order proceeding, which carries its own firearm and housing consequences.

Assault and Violent Crimes

Simple assault, aggravated assault, resisting arrest, criminal threatening, robbery, and arson.

Weapons Charges

Firearm and deadly-weapon offenses, including cases where displaying a weapon was a lawful response to a threat under New Hampshire's self-defense statute.

Theft, Fraud, and White-Collar Crimes

Shoplifting, theft by unauthorized taking, theft by deception, forgery, credit card fraud, and burglary.

Sex Crimes

Aggravated sexual assault and child sexual abuse image (CSAI) charges, where early intervention and a careful defense are critical.

Homicide

Manslaughter, negligent homicide, and murder, including multi-victim cases, defended with the preparation these charges require.

Case Results

Read how our past clients have received favorable outcomes with their cases.

Not Guilty

Jury Verdict

Defendant was driving and pulled over by a State Trooper. Her boyfriend was in the passenger seat. He had scored and used a short time earlier and still had syringes and additional doses in his sock. He was arrested, she was allowed to drive away. Months later she was indicted as an accomplice for allegedly aiding her boyfriend's possession by driving him to where he obtained the fentanyl.

Not Guilty

Jury Verdict

Client had a casual, non-romantic relationship with the accuser and she had been to his house several times. On the last visit, he was offended by her statement and behavior and told her to leave. She refused. He attempted, with minimal force, to get her to leave. She still refused, but eventually left. She later went to the police department and reported that he had attacked her and choked her.

Not Guilty

Jury Verdict

Client was barely 18 (just over the age for criminal liability in New Hampshire) when he and a younger friend (under 18 and considered a juvenile) were invited to get together with a young lady who was just under the age of legal consent (16 in New Hampshire). The lady later claimed that it was forced or involuntary. Client made a voluntary statement to the police without asking for a lawyer.

(Reminder: do not do this; ask for an attorney and tell them you do not wish to make a statement.)

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What’s At Risk Goes Beyond a Criminal Charge

A criminal charge in New Hampshire sets more in motion than most people realize. Police and prosecutors often charge the most serious offense the facts could support, and the sentence a judge hands down is only part of what’s at stake. Penalties can begin before your case is ever heard, and a conviction follows you long after the sentence is served:

Your job and livelihood.
Employers can suspend or terminate over pending charges, and a conviction can cost you a professional license, a security clearance, or the ability to drive for a living.

Jail time.
A Class A misdemeanor carries up to a year; a Class A felony up to fifteen. Many offenses carry mandatory minimums that a judge cannot waive.

Your firearm rights.
A felony or domestic violence conviction can strip your right to own a gun under state and federal law.

Your record.
Convictions surface in background checks, professional licensing, housing applications, and, for non-citizens, immigration proceedings.

New Hampshire does not clear records automatically. Annulment requires a petition and a waiting period of one to ten years after the sentence is fully completed, and some offenses can never be annulled. The best time to protect your record is before a conviction exists.

Criminal Defense Attorney Portsmouth NH

Why Clients Choose Wiberg Law Office

We are not afraid to go to trial.

Many defense attorneys plead nearly every case. Our attorneys prepare every case to be tried, and Sven Wiberg has been picking juries for over three decades.

You get real time with your attorney.

Your case will not be handled in a ten-minute phone call. You work directly with your lawyer, get direct answers, and can reach the firm 24 hours a day.

We defend your rights whether or not you think you're guilty.

Everyone charged with a crime is entitled to a defense, and the prosecution does not always play fair. We make the state prove its case the right way.

Experience across two states and federal court.

Beyond Rockingham and Strafford Counties, the firm appears in Massachusetts courts from Lawrence to Middlesex County and in federal court in both states. Few Seacoast firms can say that.

Talk to a Portsmouth Criminal Defense Lawyer Today

If you’ve been arrested for DUI, you may have only days to request your license hearing. 

If you’re facing any other charge, the choices you make now shape everything that follows.

 Wiberg Law Office offers a free, confidential consultation to review the evidence, explain the process, and tell you honestly where you stand. 

Call (603) 686-5454 or request your consultation online. 

We serve Portsmouth, Rockingham County, Strafford County, Dover, Manchester, and the Massachusetts North Shore.

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