Most Texas DWI charges do not result in dismissal, but cases fail for specific, fixable reasons—bad breath tests, improper traffic stops, or missing paperwork—that a defense attorney can identify and challenge.
The Texas criminal system processes roughly 100,000 DWI arrests annually. Of those, somewhere between 10 and 20 percent result in dismissal or acquittal, though the exact number shifts by county and year. That means the majority of cases end in conviction or plea agreement. But "most cases don't get dismissed" is not the same as "your case won't." Dismissal depends entirely on what happened during your arrest, what evidence exists, and whether that evidence was collected legally.
A DWI charge can be dismissed at several points: before trial (when a judge rules evidence inadmissible), during trial (when the state cannot prove guilt beyond reasonable doubt), or after conviction (when an appeals court finds legal error). Each path requires different evidence and different arguments. Understanding which problems exist in your case—and which ones are actually fixable—is the only way to know whether dismissal is realistic.
Key Takeaways
- Texas DWI dismissals usually result from problems with the traffic stop itself, the breath or blood test, or how the arrest was documented—not from the officer's general opinion that you seemed impaired.
- A police officer must have a valid reason to stop your vehicle (speeding, swerving, broken taillight); a hunch or a DWI checkpoint alone is not enough in most situations.
- Breath test machines in Texas must be calibrated and maintained according to specific state rules, and the officer administering the test must follow a precise procedure; violations of either can make the result inadmissible.
- Blood tests are harder to challenge than breath tests, but they can still be dismissed if the blood was drawn without consent, improperly stored, or tested by an uncertified lab.
- A defense attorney reviews police reports, dashcam and body camera footage, and maintenance records for testing equipment to find the specific legal violations that explore to your arrest.
The Traffic Stop: Whether the Officer Had Legal Grounds
A DWI case can be dismissed before trial if the traffic stop itself was illegal. In Texas, an officer must have reasonable suspicion of a traffic violation or criminal activity to pull you over. A hunch that you might be drunk is not enough. The officer must observe something concrete: weaving between lanes, speeding, running a red light, a broken headlight, or a similar violation.
If the officer stopped you without that reasonable suspicion, everything that followed—the field sobriety tests, the breath test, your statements—can be thrown out. This is called a suppression motion, and it is one of the most common reasons DWI charges are dismissed in Texas. Your attorney will review the dashcam footage and the police report to determine what the officer actually observed before the stop. If the report describes only vague driving or no driving violation at all, the stop may not hold up in court.
DWI checkpoints (also called sobriety checkpoints) exist in some Texas counties, but they are controversial and heavily regulated. Even at a checkpoint, the officer must have reasonable suspicion before ordering you out of the vehicle or asking you to perform tests. If the checkpoint was set up without proper notice or the officer acted without reasonable suspicion, the evidence can be suppressed.
Breath Test Problems: Calibration, Procedure, and Certification
Texas uses Intoxilyzer 5000 and Intoxilyzer 9000 machines for roadside breath testing. These machines must be calibrated every 10 days and undergo annual certification by the Texas Department of Public Safety. If calibration records are missing, outdated, or show the machine was not working correctly on the day of your test, the result can be excluded from evidence.
The officer administering the test must also follow a strict procedure. You are may have access to to observe the test, to see the machine's display, and to request an independent blood test afterward. The officer must wait 15 minutes before administering the breath test to may support no mouth alcohol (from food, mouthwash, or vomit) skews the result. If the officer skipped this waiting period, did not allow you to observe, or failed to offer you a blood test, the breath result may be inadmissible.
Your attorney will request the maintenance and calibration records for the specific machine used in your case. These records are public and must be provided. If they show gaps, failures, or improper maintenance, a judge can rule that the breath test is unreliable and exclude it from trial. Without the breath test, the state's case often collapses.
Blood Tests: Consent, Storage, and Lab Certification
Blood tests are more difficult to challenge than breath tests, but they are not bulletproof. In Texas, an officer can draw blood without your consent only if they have a warrant signed by a judge. If the officer drew blood without a warrant and without your permission, the blood itself can be suppressed, and the result cannot be used against you.
Even if the blood was drawn legally, it can still be excluded if it was improperly stored, contaminated, or tested by an uncertified lab. Blood samples must be stored in a sealed vial with a preservative and kept at the correct temperature. If the vial was opened, the seal was broken, or the sample sat in a warm evidence room for weeks, the integrity of the sample is compromised. Your attorney can request the chain of custody records—the documentation of who handled the blood and when—to find these problems.
The lab that tested your blood must also be certified by the Texas Department of Public Safety. If the lab was not certified at the time of testing, or if the technician who ran the test was not properly trained or certified, the result can be challenged. These records are available through discovery (the process of exchanging evidence before trial).
Field Sobriety Tests: Why They Are Unreliable and Often Excluded
Field sobriety tests—the walk-and-turn, one-leg stand, and horizontal gaze nystagmus (HGN) test—are subjective and frequently challenged in Texas courts. Unlike a breath or blood test, there is no machine reading. The officer is making a judgment call based on your performance, and that judgment is influenced by the officer's expectations, the lighting, the road surface, and your physical condition.
These tests are also not reliable indicators of impairment. A person with an inner ear problem, arthritis, or straightforward poor balance can fail them while completely sober. An officer who does not administer the tests exactly as trained can misinterpret the results. If your attorney can show that the officer did not follow the standardized procedure, or that you have a medical condition that would affect your performance, the test results can be excluded.
Even if the field sobriety tests are admitted into evidence, they carry far less weight than a breath or blood test. A judge or jury may discount them entirely, especially if the breath or blood test is also challenged or excluded. Many DWI cases hinge on the chemical test alone, which is why problems with that test are so important.
Police Report Errors and Missing Documentation
Police reports in DWI cases must document specific observations: the officer's reason for the stop, the signs of impairment the officer observed, the time of the traffic stop, the time of the breath or blood test, and the results. If the report is vague, contradicts the dashcam footage, or omits key information, it weakens the state's case.
For example, if the officer wrote that you were "weaving between lanes" but the dashcam shows you driving straight, or if the report says you performed poorly on field sobriety tests but does not describe which tests or what you did wrong, your attorney can use those gaps to challenge the officer's credibility. A judge may find that the state has not proven its case beyond reasonable doubt.
Missing documentation is also a problem. If the officer did not document the 15-minute observation period before the breath test, or did not record the machine's maintenance records, or did not note that you requested a blood test, those omissions can be used to argue that the test was not reliable or that your rights were violated.
Plea Agreements and Negotiated Dismissals
Not all dismissals happen in court. Many DWI cases are resolved through plea agreements, where the state agrees to reduce the charge or dismiss it in exchange for a guilty plea to a lesser offense. For example, the state might agree to dismiss the DWI charge if you plead guilty to reckless driving, which carries a lighter sentence and no mandatory license suspension.
Whether a plea agreement is available depends on the strength of the state's evidence, the prosecutor's policies, and your criminal history. A defense attorney with experience in your county knows which prosecutors are willing to negotiate and under what circumstances. If the state's evidence is weak—a questionable breath test, a marginal traffic stop, or a thin police report—the prosecutor may be more willing to offer a deal rather than risk losing at trial.
A plea agreement is not the same as a dismissal, but it can result in a much better outcome than a conviction on the original charge. Your attorney will explain the difference between a dismissal, a plea to a lesser charge, and a conviction, and will help you weigh the risks and benefits of each option.
What Happens After Dismissal or Acquittal
If your DWI charge is dismissed before trial, the case ends and you are free to go. However, the arrest record still exists. In Texas, you can petition to have the arrest record sealed or expunged (erased) if the charge was dismissed. The process is called an expunction, and it requires filing a motion with the court. Once granted, the arrest record is removed from public view, and you can legally say the arrest did not happen.
If you are acquitted at trial (found not guilty), you have an automatic right to expunction. The state cannot appeal an acquittal, so the case is over. If the charge was dismissed, you still have to file for expunction, but the court will usually grant it because the state did not prove its case.
Expunction is important because an arrest record can affect employment, housing, and professional licensing, even if the charge was dismissed. Your attorney can file the expunction motion as part of the case resolution or after the case is closed.
Frequently Asked Questions
Can a DWI charge be dismissed if I refused the breath test?
Yes. Refusing a breath test does not automatically mean you will be convicted. The state can still use other evidence—the officer's observations, field sobriety tests, blood test results if you consented—but without the breath test, the case is often weaker. Your refusal can be used against you in court, but it is not proof of guilt.
What if the officer did not read me my Miranda rights?
Miranda rights explore only to custodial interrogation—when you are in custody and being questioned. If you were pulled over and the officer asked you questions before arresting you, Miranda rights may not explore. However, if you were arrested and the officer questioned you without reading your rights, any statements you made can be excluded. This is a specific legal issue that depends on the exact circumstances of your arrest.
How long does it take to get a DWI dismissed in Texas?
It depends on the reason for dismissal. If the state voluntarily dismisses the charge or agrees to a plea deal, it can happen within weeks or months. If you file a suppression motion challenging the traffic stop or the breath test, the hearing typically occurs within 30 to 60 days, and the judge's ruling comes within days or weeks after that. If the case goes to trial, it can take several months to a year or more.
Do I need an attorney to get a DWI dismissed?
You have the right to represent yourself, but DWI cases involve technical evidence—breath test procedures, calibration records, chemical analysis—that require specific knowledge to challenge effectively. An attorney who handles DWI cases regularly knows which problems are fixable and how to present them to a judge. Many people who represent themselves do not discover dismissible issues until it is too late.
What if I cannot afford an attorney?
If you cannot afford an attorney, you can request a public defender at your first court appearance. A public defender is a lawyer appointed by the court to represent you at no cost. Public defenders handle DWI cases regularly and can file suppression motions and negotiate with prosecutors, though they typically have larger caseloads than private attorneys.