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our services

Flagstaff Criminal Defense Attorney Standing Between You and the System

Charged With a Crime in Northern Arizona? You Don’t Have to Face This Alone.

If you’re dealing with criminal charges in Flagstaff — whether a misdemeanor, DUI, drug crime, or a serious felony — you’re likely overwhelmed, anxious, and unsure what comes next. The justice system can be intimidating, and prosecutors often move quickly. You deserve a local advocate who will protect your rights, explain your options, and fight for the best possible outcome. The Law Office of Matthew J. Poirier, PLLC represents clients in Flagstaff, Coconino County, and communities across Northern Arizona, providing strategic defense when everything feels uncertain.

Criminal Defense Services

We defend clients facing a full range of charges, including:

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DUI Defense (All Levels)

Standard DUI, Extreme DUI, underage drinking and driving, and federal DUI cases.

Blister pack, pill, broken capsule, and tablet, representing medication.

Drug Crimes

Possession, paraphernalia, intent to distribute, and prescription-related charges.

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Assault & Domestic Violence

Responding to accusations involving fights, family disputes, or domestic allegations.

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Disorderly Conduct & Public Disturbance

Common charges for students, tourists, and those involved in alcohol-related or noise-related incidents.

Car with driver.

Criminal Traffic Offenses

Reckless driving, aggressive driving, and other serious roadway offenses.

Person behind prison bars, holding onto them.

Felonies & Serious Charges

From aggravated assault to complex multi-charge cases, we understand the high stakes and build strong defense strategies.

Deep Knowledge of Flagstaff Courts and Northern Arizona Legal Systems

When your future is on the line, local insight matters. Our firm regularly appears in:



  • Flagstaff Municipal Court
  • Flagstaff Justice Court
  • Coconino County Superior Court
  • Federal Court in Flagstaff


We know the judges, prosecutors, and unique procedures in these courts — insight that helps us develop smart strategies for negotiation, motions, and trial preparation.

Dark wood-paneled office with a desk, books, a statue of justice, and a gavel.
Documents and handcuffs.

What Outcomes We Fight For

Every case is different, but our goals often include:


  • Case dismissal or suppression of evidence
  • Charge reduction (felony to misdemeanor)
  • Avoiding jail time
  • Securing diversion programs for first-time offenders
  • Reducing fines, probation terms, or license impacts
  • Protecting your criminal record and future opportunities



We prepare every case as if it could go to trial — and strong preparation often leads to better negotiated outcomes.

Why Clients Across Northern Arizona Trust Us

Local Experience + Personal Attention

We’ve defended students, professionals, visitors, and long-time residents through some of the most stressful moments of their lives. You’re not a case number — you get hands-on support at every step.

Federal Court License (A Key Advantage)

Unlike many Flagstaff firms, we can represent clients in federal court, which is crucial for cases arising on federal land or involving federal agencies.

Full Transparency & Clear Guidance

From the first meeting, you’ll understand the charges, possible outcomes, and the defense plan ahead. No surprises, no confusion.

Strong Advocacy Against State Power

The government has considerable resources — but we challenge improper stops, unlawful searches, flawed testing, unreliable witnesses, and procedural errors to protect your rights.

What to Expect After Hiring Us

Recovering from an accident is stressful, but the legal process doesn’t have to be. We make each step clear so you always know what comes next.



Steps:

01

Free, confidential consultation

02

Immediate review of charges and police reports

03

Investigation into facts, evidence, and possible rights violations

04

Clear explanation of your options and recommended strategies

05

Aggressive negotiation or trial preparation

06

Consistent communication so you always know what comes next

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The Sooner You Call, the Stronger Your Defense

Criminal cases move quickly in Flagstaff and Coconino County. Early representation can make the difference between a conviction and a second chance.