McMahon Law Offices
Charged with a crime in DuPage County? Get a former prosecutor and retired judge to lead your defense. Call for a free case review.
Schedule a Free Case Review
"Every case has vulnerabilities the prosecution hopes you never find. Our job is to find them first."
— Mike McMahon, Former DuPage County ProsecutorOverview
McMahon Law Offices provides experienced, respected, and aggressive defense to those charged with a crime in DuPage County.
A criminal charge can cost you your career, your relationships, and your freedom. We handle the fight.
We have defended thousands of criminal cases in DuPage County. Led by a former prosecutor and a retired judge, we know both sides of the courtroom. We use that knowledge to find every advantage your case allows.
We fight for dismissals, reduced charges, not guilty verdicts, and outcomes that protect your record and your future.
Practice Areas
We defend clients against every criminal charge in DuPage County.
We defend DUI, aggravated DUI, felony DUI, and breathalyzer refusal cases.
Explore DUI Defense
We defend possession, intent to deliver, trafficking, and cannabis charges.
Explore Drug Defense
We defend domestic battery, aggravated battery, and order of protection violations.
Explore Domestic Defense
We defend assault, battery, armed robbery, and attempted murder charges.
Explore Violent Crime Defense
We defend retail theft, burglary, residential burglary, and identity theft charges.
Explore Theft Defense
We defend reckless driving, suspended license, and criminal traffic offenses.
Explore Traffic Defense
We defend UUW, FOID violations, illegal firearm possession, and carry violations.
Explore Weapons Defense
We defend fraud, embezzlement, money laundering, and financial crime charges.
Explore White Collar Defense
We defend sexual assault, sexual abuse, and sex offender registration violations.
Explore Sex Crime DefenseCase Results
Every result below is a real case handled in DuPage County.
Why McMahon Law Offices
Experience on both sides of the courtroom gives our clients a decisive edge.
DCBA Member
Top 100 Trial Lawyers
ISBA Member
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IPBA Member
Avvo Rating 10.0
5-Star Reviews
Mike McMahon prosecuted cases for the state. He knows how they build evidence, what they fear losing, and when they are bluffing.
Judge Pierce spent years on the bench. He knows every judge in DuPage County personally and what arguments land in each courtroom.
Arrests don't follow business hours. Call us anytime. Nights, weekends, holidays.
Dismissals, not guilty verdicts, reduced charges, minimal sentences. We don't just practice law. We win.
40+ years in DuPage County courts. Every prosecutor, every judge, every court clerk. Those relationships benefit your case.
We prepare every case for trial. Prosecutors know it. That reputation gets you better outcomes before we ever step into a courtroom.
How To Get Started
A simple, straightforward process from your first call to your first court appearance.
Call us or fill out our contact form to schedule a free case review.
Tell us what happened, when you were charged, and what you are facing.
We walk you through your defense options, the process, and pricing.
We start working immediately. You rest knowing you're in good hands.
Attorneys
A former prosecutor and a retired judge, fighting for your defense.
Areas We Serve
We defend clients throughout DuPage County and neighboring Illinois counties.
2150 McDonald Dr Suite 1608
Oak Brook, IL 60523
Available for in-person case reviews upon request. We serve all of DuPage County and neighboring counties throughout Illinois.
Do not make any statements to police beyond your name and basic identifying information. Do not consent to searches. Call an attorney immediately. For DUI arrests specifically, you have 90 days to challenge your license suspension, and your first court date is almost always scheduled after that deadline. The earlier you call, the more options we have.
Yes. Charges are dismissed regularly when evidence was obtained through an illegal search, when the traffic stop lacked reasonable suspicion, when testing equipment was improperly calibrated, or when witnesses are unreliable. Every case has potential vulnerabilities. Our job is to find them.
Misdemeanors (Class A, B, C) carry up to 364 days in county jail. Felonies (Class 4 through Class X) carry 1 to 60 years in state prison depending on the class. Both result in a permanent criminal record. The charge classification determines the courthouse procedures, plea options, and sentencing range your case falls under.
Yes. Criminal convictions in Illinois appear on background checks permanently. They affect employment, housing, professional licensing, education, and immigration status. Some offenses are eligible for expungement or sealing, but many (including DUI) are not. Avoiding a conviction in the first place is always the best outcome.
Yes. A misdemeanor conviction is permanent and can affect your employment, housing, and professional licenses for life. An experienced attorney can identify defense angles, negotiate with prosecutors for reduced charges or supervision, and protect your record in ways that are not available to someone representing themselves.
Misdemeanor cases typically resolve within 3 to 9 months. Felony cases can take 6 to 18 months or longer depending on complexity, discovery, and whether the case goes to trial. We give you a realistic timeline at your consultation based on the specific facts and charge.
We defend all criminal charges in DuPage County: DUI and drunk driving, drug possession and delivery, domestic violence and battery, assault and aggravated battery, theft and property crimes, weapons charges, felonies of all classes, and expungement petitions. If you have been charged with a crime in DuPage County, we can help.
Resources
Guides written to help you understand your charges, rights, and options.
Get Started
Submit a contact form or call us to schedule your free case review.
Your information is confidential and protected by attorney-client privilege. We will never share your information.
