
Challenging Blood & Breath Tests
With more than 30 years of legal experience and a background as a prosecutor, attorney Tad Nelson provides the assertive representation you’ll need when facing criminal charges in connection with drunk driving.
Mr. Nelson, and all of the other attorneys at our firm, utilize an in-depth understanding of the science behind DWI charges to challenge the results of breath and blood tests and protect the freedom of people in and around Greater Houston and throughout Texas.
Understanding Breath Analysis
The Intoxilyzer 5000 is the machine used for breath tests in Texas. Using infrared light to measure alcohol molecules, these machines estimate your blood alcohol concentration (BAC) to determine your intoxication level. We defend our clients’ rights by challenging the overall validity of breath tests and:

- The reliability of breath tests,
- The science behind breath tests,
- The maintenance of the machine used in your case,
- The certification and other credentials of the officer who administered the breath test,
- The qualifications of the maintenance technician who serviced the machine,
- and whether the officer considered extenuating circumstances, such as your weight and other medical conditions that can affect breath test results.
We use these and all other available DWI defense strategies to defend our clients in Houston and throughout Texas. Our proven trial techniques have led to many successful outcomes for our clients, and kept DWI convictions from ruining their lives.
Understanding Blood Tests
If a law enforcement officer can demonstrate probable cause that you were driving while intoxicated, he or she will ask a judge or magistrate for a warrant to draw your blood. If the officer is successful in obtaining this warrant, you must submit to the blood draw or you will be held down while your blood is forcibly drawn.
Even if an officer obtains a warrant to get a sample of your blood, you have options. We have helped many clients prevent blood samples from being admitted into evidence against them because of:
- Faulty blood testing procedures
- An officer misstating evidence in court
- Officers omitting essential information from the warrant application
- Law enforcement personnel not being fully honest with the court
Contact The Law Offices of Tad Nelson & Associates
Houston, Galveston, League City And Statewide
If you or a loved one were arrested for drunk driving in the Houston area, it behooves you to protect your rights and arrange a free initial consultation with one of our assertive defense lawyers by calling 281-280-0100 today.
Houston Lawyer for Challenging Blood and Breath Tests
The Law Offices of Tad Nelson & Associates
Free Consultation
Contacting us will only take a moment of your day
Testimonials
Tad and Amber are literally top of the game. When I need results, they are the only people I trust. Quality of service, knowledge and professionalism throughout. Don't gamble with a lawyer on any legal issue, you only want to bet on the best!
Thank you Tad Nelson for standing up for me and what is right, Tad Nelson is obviously well known and respected through out the court system as he spoke with authority and precisely to the assistant DA resulting in the dismissal of my case before the case went to trial. Thank you again. if you want it done call Tad Nelson
I hired them a while back for a DWI out in Harris County, they're good and if you need help with any kind of legal matter, give em a call. For a lawyer, Tad has a great personality so working with him should be easier than working with other lawyers.
He is the one lawyer that I can call and put my trust into. We’ve used him a couple of times, once for a family matter and another time for a troubled relative. He’ll help, tell you the truth with no sugar-coating, and will work for his salt. He’s a good guy and when you go to their office, they make you feel at home, like you’re part of the team. Good lawyers and great folks.
I've had the pleasure of working with Tad personally as a technology consultant for him in the past. We've eaten lunch and dinner together. I know that Tad is very dedicated to his clients and cares for them off the clock. He's definitely the lawyer you want on your side.