
St. Louis First DWI Defense Attorney
Arrested for a DWI for the First Time in St. Louis, MO?
If you've been arrested for a first-time DWI in Missouri, you're likely feeling overwhelmed, anxious, and unsure of what to do next. At The Hammer Law Firm, LLC, we understand the emotional and legal weight a first offense can carry. You deserve experienced legal guidance and a personalized defense strategy designed to protect your future. As a trusted St. Louis first DWI defense lawyer, we are here to help you fight the charges, navigate the legal system, and work toward the best possible outcome.
Call (314) 334-3807 today to schedule a free consultation with an experienced St. Louis first DWI defense attorney, or fill out our online contact form.
What is Considered a DWI in Missouri?
In Missouri, Driving While Intoxicated (DWI) is defined as operating a motor vehicle while in an intoxicated or drugged condition. A person is legally considered intoxicated if they have a blood alcohol content (BAC) of 0.08% or higher. For commercial drivers, the legal limit is 0.04%, and for drivers under 21, any BAC over 0.02% can lead to arrest.
However, you can still be charged with a DWI even if your BAC is below the legal limit if law enforcement believes alcohol or drugs impaired your ability to operate a vehicle safely. This means that the charge isn’t limited to alcohol—it can also involve prescription medications, marijuana, or other controlled substances.
The Legal Process After a First DWI
Being arrested for a first DWI in St. Louis triggers two separate legal processes: the criminal case and the administrative license action by the Missouri Department of Revenue (DOR).
The Arrest
Typically, a first DWI arrest begins with a traffic stop, a roadside sobriety test, and possibly a chemical breath or blood test. If the officer believes you’re impaired, you’ll be taken into custody.
Administrative License Suspension
After your arrest, you only have 15 days to request a hearing to challenge the suspension of your driver’s license. If you fail to act, your license may be suspended for 90 days or more.
Criminal Charges
Your criminal case will proceed through arraignment, pretrial conferences, and possibly trial. A first DWI is usually charged as a Class B misdemeanor, but certain aggravating factors (such as having a minor in the vehicle or an extremely high BAC) could enhance the charges.
Court Appearance
With an experienced St. Louis first DWI defense attorney from The Hammer Law Firm, LLC, you may not have to appear in court in person for all hearings. We’ll handle much of the legal legwork while working to minimize penalties or seek a dismissal or reduction in charges.
First DWI Penalties
Although a first DWI is a misdemeanor in Missouri, the consequences can be significant and long-lasting, especially without proper legal representation.
Criminal Penalties
- Jail Time: Up to 6 months
- Fines: Up to $1,000
- Probation: Often 1-2 years
- Community Service: Frequently required
- DWI Education Program: Mandatory SATOP (Substance Abuse Traffic Offender Program)
Driver’s License Penalties
- 90-day license suspension
- Eligibility for restricted driving privilege (RDP) with installation of an ignition interlock device (IID)
Other Consequences
- Higher insurance rates
- Permanent criminal record
- Possible employment issues, especially for jobs requiring driving.
FAQs About a First DWI Charge in St. Louis
Is a first DWI a felony in Missouri?
No, a first DWI is typically a Class B misdemeanor unless there are aggravating factors like injury to another person, a child passenger, or prior alcohol-related incidents.
Can I get my DWI charge dismissed?
It is possible to have charges reduced or dismissed depending on the strength of the evidence, the legality of the traffic stop, and whether your rights were violated. A skilled DWI defense attorney can evaluate your case for these opportunities.
Will I lose my driver’s license?
A first DWI often results in a 90-day suspension, but you may be eligible for a restricted driving privilege if you install an IID and complete SATOP.
Do I need a lawyer for a first-time DWI?
Yes. Even a first DWI can carry severe penalties and long-term consequences. A knowledgeable attorney can help you avoid mistakes, negotiate better outcomes, and fight for your rights at every stage.
How long does a DWI stay on my record in Missouri?
A first-time DWI stays on your criminal record permanently unless you are eligible for expungement, which is only possible after 10 years, and only under certain conditions.
Why Choose The Hammer Law Firm, LLC as Your St. Louis First DWI Defense Attorney?
At The Hammer Law Firm, LLC, we combine deep knowledge of Missouri DWI laws with decades of courtroom experience. Our legal team has helped countless first-time offenders avoid jail, reduce charges, and preserve their driving privileges. We investigate every detail—from the traffic stop and breath test to officer conduct and procedural errors—to build the strongest defense possible.
We treat every client with respect, discretion, and personalized attention. We understand that this may be your first encounter with the criminal justice system—and we’re committed to guiding you every step of the way.
Contact us today at (314) 334-3807 for your free consultation and take the first step towards defending your rights and securing the support you deserve.

client testimonials
At The Hammer Law Firm, LLC, your satisfaction is our priority! See for yourself what our clients have to say about working with us.
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Growing up often has painful mistakes, as my son can attest to! Mark and Nicole were both sympathetic and supportive as they ...
- D.S. -
I cannot begin to explain in words how thankful I am that I contacted the Hammer Law Firm when I found myself facing criminal legal charges. I and my family will always be grateful beyond words for the role that Mark Hammer and The Hammer Law Firm played i
- Former Client -
They are professional, courteous, and respectful to both the courts and their clients. This team of professionals is not in business just for the money, they are truly out to help their clients.
- C.E. -
After a thorough review, Mark began to address every legal issue confronting our son, he had already done his homework, which began to bring sanity back into our family as we sat there.
- Ken -
We contacted Mark Hammer for help with our son. Mark was truly amazing! He worked hard for our son, was always a text or phone call away, and we could not have asked (or predicted) a better outcome! Absolutely in awe of him.
- D.C. -
Thank you so much, Nicole. I have faith and believe everything that's happening is for a reason. I know everything will be fine and I believe you are going to do everything you can and I'm very grateful for it.
- C.G. -
I absolutely recommend Mark and Nicole to anyone who is needing more than a lawyer, but people who do genuinely care about you and who want to get the best possible outcome to get you through this difficult time.
- E.M. -
I just wanted to thank you again for your compassion, kindness, and support given to my family throughout this ordeal. I thank the Hammer Law Firm for not only giving my son his life back but his family as well.
- Former Client


WHY TRUST OUR ST. LOUIS CRIMINAL DEFENSE LAW FIRM?
What Makes Us Different
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We work directly with you to determine the best possible outcome based on your goals and needs. We then create personalized legal strategies to set your case up for success.
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Our attorneys pride ourselves on always being available to address any questions you have regarding your case. With our team, you aren't just a number.
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As former prosecutors who know how the 'other side' operates, we have a unique insight that allows us to set our client's cases up for success.
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The Hammer Law Firm, LLC team has more than 60 years of combined criminal law experience. We have the tools, knowledge, and resources to effectively advocate on your behalf.

When you want personal support and proven representation, you need to bring The Hammer Law Firm, LLC to the fight.