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  • TBLS Board Certified in Criminal Law

    Mark Thiessen is honored to be selected to this prestigious Criminal Law certification which distinguishes only a few attorneys as specialists.

  • Top 100 Super Lawyers in Houston - 2017-2018

    Our firm had been selectively chosen during Super Lawyers’ rigorous evaluation.

  • DUIDLA - Board Certified

    Board certification by the DUI Defense Lawyers Association (DUIDLA) is only earned by those who score a passing grade or higher on the Board Certification Exam. At Brockmeyer Law Offices, our DUIDLA Board Certification demonstrates an exhaustive, in-

  • ACS/CHAL Lawyer Scientist

    An ACS-CHAL Forensic Lawyer-Scientist is someone who used validated, legitimate science to benefit others in their pursuit of justice.

  • National College for DUI Defense

    We, along with our fellow College members, are some of the most experienced DUI defense lawyers in the nation. Only attorneys who have consistently demonstrated exceptional skill in handling DUI matters are appointed to the College.

  • The National Trial Lawyers Top 100

    We are among the nation’s most elite trial advocates, and our membership with National Trial Lawyers: Top 100 allows us to become even better through continuing legal education (CLE) programs.

  • Super Lawyers

    Super Lawyers designations are reserved only for attorneys who display a commitment to excellent client experiences and consistently positive results in court, as determined during objective review by third parties, nomination by established peers.

  • AV Preeminent Rated by Martindale-Hubbell

    AV Preeminent Ratings are awarded based on outstanding peer reviews and client testimonials. This is the highest peer rating standard in the legal industry.

  • Avvo 10.0

    A perfect score from Avvo is calculated by evaluating a firm’s experience, proven skill, track record, and client reviews.

  • Texas Criminal Defense Lawyers Association (TCDLA)

    As members of the TCDLA, we are proud to be regular participants in the Association’s educational programs.

Houston DWI Lawyers

DWI Arrest? Our Trial Attorneys Fight to Win. Call (713) 999-3959.

Were you arrested and charged with driving while intoxicated (DWI) in Texas? If so, you have some prompt deadlines approaching in order to save your driver’s license. Thiessen Law Firm offers a free case evaluation, and we are available 24 hours a day, 7 days a week to ease your concerns and protect your freedom.

In the face of drunk driving charges, you need the best DWI lawyer Houston has to offer. You won’t find more aggressive trial attorneys to defend your DWI case or other alcohol-related offenses, or one with a better success rate than our team. Our founding attorney Mark Thiessen is Board Certified in Criminal Law by the Texas Board of Legal Specialization, Board Certified in DUI Defense by the DUI Defense Lawyers Association, has been voted a Top 100 Trial Lawyer by The National Trial Lawyers Association (2014 - Present) and voted a Texas Super Lawyer by Thompson Reuters (2010 - Present).

We've Won 100+ Not Guilty Verdicts for Clients!

We Understand the Science of DWI Cases

Too many attorneys falsely represent themselves as having expertise in the intricacies of DWI/DUI law, but our firm actually practices what we preach. We dissect DWIs with scientific precision because, though we practice all criminal law and alcohol-related offenses, we are trained and specifically emphasize in driving while intoxicated defense. We actually have the expertise that you need to get the best DWI representation possible.

First, if you have not been bailed out, call Burns Bail Bonds at 713-224-0305. Then, once you are rested, give us a call to set up your free DWI case consultation. We will meet you anytime we are not in trial or in court, even on the weekends.

For more information about DWI cases, our case results and client testimonials speak for themselves. Or, give us a call at (713) 999-3959 to find out how we can start fighting for you.

How We Handle Your Houston DWI Case

First, we need to see what court you landed in. The particular court tells us a lot about how the judge operates, who the prosecutors are, and what chance this case has of getting dismissed. Some courts have unreasonable prosecutors who refuse dismissal and we must go to trial.

On a side note, some lawyers will tell their clients that everything will be okay or dismissed at the initial consultation. That is simply malpractice. At this point in the case, they do not know enough to make such a statement and are just giving you a false sense of security. At Thiessen Law Firm, we are honest with you from the very beginning.

When you seek the counsel of our Houston DWI attorneys, we will need the following:

  • Offense Report: We will get the Offense Report at the first court date and sit down with you and show you the contents. There are many ways around a DWI conviction. Why were you pulled over? Is that reason consistent with the current case law? Next, who is the officer? Is he DPS or a DWI Task Force Officer, or is he an inexperienced patrolman who is going to crumble on the stand? What Standard Field Sobriety Tests did you perform? Did you have any prior mental or physical injuries?
  • Video: We will request the video of the arrest. It is up to the officer to turn in the video tape, if there is one. If there is not a video, we will subpoena his patrol vehicle’s maintenance records and figure out why there was not. If there is a video, we will watch it and ask that you do as well. Then, together, we can discuss the pros and cons of contesting what is on the video. Are we able to suppress the video? Usually not. But we can suppress portions if they violate the law. We will also secure the station video and see how you looked when you were booked at the station. Again, we will discuss the pros and cons of using this video and weigh out our options.
  • Breath Test Score: Only about 5% of attorneys are capable of trying a breath test case with a chance of winning. Mark Thiessen is trial tested and proven. In fact, he speaks to other lawyers at national seminars on how to beat the machine and how to beat high breath test scores without the use of an expert. And since he’s also an honest lawyer, you must know that he will need a good video to beat a high breath test. If you had a low breath test, Mark Thiessen can usually educate the jury on all of the problems with the breathalyzer machine and the acceptable ranges of error in order to explain the reading. The Intoxilyzer 500EN is outdated and in need of replacement. While some Texas counties still use the 5000, many states have already abandoned the machine and moved on the better or newer models. The new Intoxilyzer 9000 has been implemented recently, and Mark already lectures on the pitfalls of this new machine and its software. At Thiessen Law Firm, we keep extensive breath test records on all breath test machines.
  • Blood Test Results: Less than 1% of criminal attorneys can win a blood test trial with the blood being admitted into evidence. Mark Thiessen has won countless blood test trials where the blood came in to evidence and the jury returned a verdict of Not Guilty (from 0.06 to 0.29). Anyone can win a trial with the blood suppressed. You need an attorney who can win even with blood test evidence in play. The science is based on gas chromatography, mass spectrometry gas chromatography, or enzymatic assay testing, and is highly scientific. Mark Thiessen is one of the few Houston DWI lawyers who can explain the science of gas chromatography to you in terms that you can understand and can convince a jury of the unreliability of the machine and the program. He also knows Mass Spectrometry and is a published author on Hospital Enzymatic Assay testing. Only a skilled and knowledgeable DWI trial lawyer will not only challenge the four corners of the warranty and the chain of custody with the blood, but will also know how the science works and where problems arise in that process.

You only have 15 days to
save your license!

If you've been arrested for a DWI or DUI in the state of Texas, you are facing two cases against you. The first one is the criminal case by the state of Texas, and the other is by the Texas Department of Public Safety to suspend your license.

Learn More

How Do You Win a DWI Trial?

Few lawyers have learned to win DWI trials on a regular basis. DWI is one of the hardest cases to try because it is an opinion crime. Intoxication is defined as not having the normal use of your mental or physical faculties, or having a blood alcohol concentration of 0.08 or higher.

For more information on DWI, you can review Texas Penal Code Title 10, Chapter 49 “Intoxication and Alcoholic Beverage Offenses.”

A skilled DWI trial attorney will systematically weave a thread of doubt throughout the entire case, demonstrating to the jury everything that occurred leading up to, during, and after the arrest. The police and District Attorney (DA) only focus on the negative aspects of your police interaction. We give the jury ALL the information they need to follow the law. The State must prove you guilty beyond a reasonable doubt and it is their job to do so. Our job is to reveal the truth to the jury, even if it prevents the DA from completing their mission. When Thiessen Law Firm represents you, very rarely will a jury decide guilt beyond a reasonable doubt based on an officer’s opinion that you lost your normal mental or physical faculties. We've even won not guilty verdicts for intoxicated manslaughter and intoxicated assault cases at trial. What separates us from the other Houston DWI attorneys is that we care about our clients. We get to know who you are so that we can present the real you to the jury for their consideration.

If the State has a breath or blood test, your case might become more difficult, but a fair jury will still follow the law and find you not guilty. The State must prove that your BAC is accurate and reliable beyond a reasonable doubt. We have rarely met a DA with enough knowledge and understanding of the Intoxilyzer machine and gas chromatography to be able to convince a jury upon the reliability of the results. Blood is more difficult to defend than breath and, again, few DWI defense attorneys understand the science, and even fewer DAs understand blood. It is absolutely crucial that you hire a trained and experienced DWI attorney.

Take the first step toward avoiding a DWI conviction. Call (713) 999-3959 now for your free, confidential consultation with our skilled team.

Free Consultation

Please call or complete the form below and we will respond back as soon as possible.

713.864.9000 Get Started Now Available 24 hours a day, 7 days a week.
  • "The BEST Attorney in Harris County!!"
  • "If You Want a GREAT Lawyer, Mark Thiessen is Your Man"
  • "The Best Lawyer in the Industry"
  • "Excellent Attorney to Have Represent You"
  • "Fantastic Lawyer!"
  • "Best DWI Lawyer out there!"
  • "Mark Thiessen Has The “IT” Factor"
  • "Amazing, Reliable and Superb Attorney! The Great Mark Deserves 100% Marks"
  • "You Cannot Compare Anybody with Mr.Mark!"
  • "Mark Eres Mi Hombre Que Luchó Por Mi Libertad y Justicia!!!"
  • "When you really need somebody to defend you I recommend you go hire Mark Thiessen."
Read Our Testimonials


Not Guilty Verdicts
  • .171 Breath Test - Not Guilty
  • 0.119 Blood Test - Not Guilty
  • 0.158 Blood Test - Not Guilty
  • 0.146 Breath Test - Not Guilty
  • 0.176 Breath Test - Not Guilty
  • 0.184 Blood Test - Not Guilty
  • 0.10 Breath Test - Not Guilty
  • 0.194 Blood Test - Not Guilty
  • 0.16 Breath Test - Not Guilty
  • 0.199 Blood Test - Not Guilty
  • 0.140 Breath Test - Not Guilty
  • 0.098 Blood Test - Not Guilty
  • 0.127 Breath Test - Not Guilty
  • Not Guilty - Not Guilty
  • 0.144 Breath Test - Not Guilty
  • 0.172 Breath Test - Not Guilty
  • .24 Breath Test - Not Guilty
  • Intoxicated Assault - Dismissed
  • .17 Breath Test - Dismissed
  • .22 Blood Test - Dismissed Mid Trial
  • .16 Breath Test - Dismissed
  • 0.161 Blood Test - Not Guilty
  • No Test, No Accident - Not Guilty
  • .16 Blood Test - Not Guilty
  • .21 Blood Test - Not Guilty
  • 0.226 Blood Test - Not Guilty
  • Intoxicated Manslaughter - Not Guilty
  • DWI - Not Guilty
  • DWI Breath Test .10 - Not Guilty
  • 0.138 Blood Test - Not Guilty
See Our Results
Request Your Free eBook

A Texas DWI Can Cost You $15,000

Get the DWI facts no Texan should drive without, including:
  • 3 rights you can exercise when you get pulled over
  • How to save your license from suspension
  • Why you should refuse any roadside tests
  • What to say during your booking
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Meet Our Legal Team

As one of Houston’s most distinguished criminal defense firms, Thiessen Law Firm emphasizes quality over quantity. We will get to know your case better than anyone and will utilize every tool at our disposal to secure the results you need. We are dedicated to your needs – 24 hours a day, 7 days a week. As soon as you hire us, you will receive the direct contact information on everyone on your case.

Meet Our Team
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