Most Texas DWI cases do not end in dismissal, but the odds depend heavily on the specific facts, the arresting officer's conduct, and whether you have legal representation
Texas courts dismiss somewhere between 5 and 15 percent of DWI cases before trial, though the exact rate varies by county and court. A dismissal is not the same as acquittal — it means the case is thrown out before a verdict, usually because the prosecution cannot proceed or because a legal defect makes the evidence inadmissible. The vast majority of DWI cases in Texas end in plea agreements, convictions at trial, or deferred adjudication programs, not dismissals.
Understanding what actually gets cases dismissed, and how rare that outcome is, matters because it shapes what to expect and what defenses are worth pursuing. Most dismissals happen because of problems with the traffic stop itself, flaws in how the breath or blood test was conducted, or failures by the prosecution to preserve evidence or meet important date. These are specific, provable defects — not arguments that you were not impaired.
Key Takeaways
- Dismissals happen in roughly 5 to 15 percent of Texas DWI cases, most often because of problems with the traffic stop, breath or blood test procedures, or officer conduct.
- A motion to suppress evidence — challenging whether the stop or test was lawful — is the most common path to dismissal, but requires a hearing where the judge decides whether police followed the rules.
- Cases are also dismissed when the prosecution cannot locate a witness, loses evidence, or fails to meet discovery important date, not because the defendant is innocent.
- Breath test results can be thrown out if the machine was not properly calibrated, the officer did not observe the defendant for 15 minutes before the test, or the test was not administered by a certified operator.
- Blood test results face dismissal less often than breath tests, but can be excluded if the blood was drawn without consent, improperly stored, or tested by an uncertified lab.
Why the traffic stop itself is the most common reason for dismissal
A police officer must have reasonable suspicion — a specific, articulable reason — to pull you over. That reason cannot be a hunch, a profile, or a guess. If the officer stopped you for weaving between lanes but dashcam video shows you stayed in your lane, or if the officer pulled you over for a broken taillight that was actually working, the stop itself was unlawful. When a stop is unlawful, everything that comes after it — the field sobriety tests, the breath test, the arrest — is considered "fruit of the poisonous tree" and can be excluded from evidence.
Your attorney files a motion to suppress asking the judge to throw out the evidence gathered after the stop. The prosecution then has to prove at a hearing that the officer had a lawful reason to stop you. If they cannot, the judge grants the motion, the evidence is excluded, and the case often collapses because the prosecution has no way to prove impairment. This is why dashcam and body camera footage is so important — it either backs up the officer's story or contradicts it, and judges rely on it heavily when deciding whether the initial reason for the stop was real.
Breath test problems that lead to dismissal
Texas breath tests are administered using machines called Intoxilyzers, and the state has strict rules about how they must be operated and maintained. If any of these steps were skipped or done wrong, the test result can be thrown out. The officer must observe you for 15 minutes before the test to make sure you did not eat, drink, smoke, or regurgitate — anything that could leave residue in your mouth and inflate the reading. The machine must be calibrated according to a specific schedule, and records of that calibration must be available. The person administering the test must hold a current certification from the Texas Department of Licensing and Regulation.
If the officer did not observe you for the full 15 minutes, or if calibration records are missing or show the machine was out of tolerance, the test is often excluded. Some counties have had widespread problems with Intoxilyzer maintenance, and defense attorneys in those areas have successfully challenged hundreds of tests. The prosecution bears the burden of proving the machine was working correctly, and if they cannot produce the maintenance logs or certification records, the judge will suppress the result. This is one of the most straightforward paths to dismissal because it does not require arguing about what the officer saw — it is a matter of whether the equipment was maintained properly.
Blood test exclusions and why they are less common
Blood tests are harder to challenge than breath tests because they are generally more accurate and the chain of custody is usually documented. However, dismissals do happen when the blood was drawn without consent, when the phlebotomist was not certified, when the blood was stored improperly, or when the lab that tested it was not accredited. Texas law requires that a blood draw be either consensual or supported by a warrant. If you refused a breath test and the officer drew blood without your consent and without a warrant, that blood can be excluded.
Storage and testing problems are less common grounds for dismissal but do occur. If the blood sample was not refrigerated, was stored for an unreasonably long time before testing, or was tested by a lab that did not follow proper procedures, the defense can argue the result is unreliable. These cases require informed testimony and detailed records, so they are more expensive to pursue than breath test challenges. The prosecution must show that the blood was handled correctly from the moment it was drawn until it was tested, and any gap in that chain can be used to challenge the result.
Prosecution failures that result in dismissal
Cases are also dismissed when the state fails to meet its obligations, not because the defendant is innocent. If the prosecution does not turn over evidence to the defense by the important date, loses a key witness, or fails to preserve evidence, the judge may dismiss the case. Texas courts have dismissed DWI cases because the prosecution could not locate the officer who made the arrest, could not produce the dashcam video, or failed to provide lab reports on time.
These dismissals are less common than they used to be because prosecutors have become more organized, but they still happen. If you have an attorney, they will file discovery motions demanding all evidence the state has, and if the state does not comply, your attorney can ask the judge to dismiss the case or suppress the missing evidence. The state's failure to preserve evidence — such as deleting dashcam footage or not storing the blood sample correctly — can also lead to dismissal if the defense can show the missing evidence was material to your case. Prosecutors are required to turn over all evidence that could help the defense, and violations of that rule have consequences.
Field sobriety test problems and their role in dismissal
Field sobriety tests — the walk-and-turn, one-leg stand, and horizontal gaze nystagmus (HGN) test — are subjective and often challenged. Unlike breath or blood tests, there is no machine reading to point to. The officer is making a judgment call about whether you passed or failed. If the officer did not administer the test according to National Highway Traffic Safety Administration (NHTSA) standards, or if conditions were poor (uneven ground, bad lighting, wind), the test results can be excluded or given little weight.
Field sobriety tests alone rarely lead to dismissal, but they often weaken the prosecution's case. If the breath or blood test is also excluded, and the only remaining evidence is a poorly administered field sobriety test, the judge or jury may find reasonable doubt. Video of the tests is crucial — if you were steady, articulate, and coordinated on the video, that contradicts the officer's written report. The more evidence the prosecution loses, the more important these subjective observations become, and the more vulnerable they are to challenge.
What happens after a case is dismissed
If a case is dismissed, the arrest record still exists, but you may be able to have it expunged or sealed. Texas law allows you to petition for expungement if the case was dismissed, and if the petition is granted, the arrest is treated as if it never happened — you can legally say you were not arrested. The expungement process takes a few months and requires filing a petition with the court. Some counties process these faster than others, and some prosecutors oppose them, which can delay the process.
A dismissal is not a conviction, and it does not count against your driving record or your criminal history for most purposes. However, if you are arrested again, the prosecutor can still use the dismissed case to argue you have a pattern of behavior, so the dismissal does not erase the arrest entirely from your background. Expungement removes that possibility, which is why it is worth pursuing if your case is dismissed.
Why most cases do not end in dismissal
The reason dismissal rates are low is that most DWI arrests have at least some evidence of impairment — a breath or blood test result, an officer's observations, or both. Even if there are problems with how the test was conducted, the prosecution often has other evidence to fall back on. If you performed poorly on field sobriety tests and the officer noted slurred speech and bloodshot eyes, the case may survive even if the breath test is excluded. Judges and juries tend to believe officers, and the burden is on the defense to prove the stop was unlawful or the test was faulty, not on the prosecution to prove guilt beyond a reasonable doubt at the suppression hearing stage.
Cases that do get dismissed usually have a clear, provable defect — the officer had no reason to stop you, the breath machine was not calibrated, or the prosecution lost critical evidence. If your case has one of these problems, an attorney can identify it and pursue dismissal. If it does not, the realistic options are usually negotiating a plea agreement, pursuing deferred adjudication, or going to trial and hoping for acquittal. The key is having someone review the facts and the evidence early to determine whether dismissal is a realistic goal or whether other strategies make more sense.
Frequently Asked Questions
Can a DWI be dismissed if I was actually impaired?
Yes. A dismissal is not based on whether you were impaired — it is based on whether the evidence was gathered lawfully and can be used in court. If the officer had no reason to stop you, or if the breath test was administered incorrectly, the case can be dismissed even if you were over the legal limit.
How long does it take to get a case dismissed?
It depends on the reason. If the prosecution fails to meet a important date or loses evidence, dismissal can happen within weeks. If you file a motion to suppress and need a hearing, it usually takes two to four months to get a hearing date, and the judge may rule when ready or take weeks to issue a written decision. Some cases are dismissed on the first court date, others take six months or longer.
Do I need an attorney to get a DWI dismissed?
You can represent yourself, but the odds of dismissal are much lower without an attorney. Dismissals require knowing the specific rules about traffic stops, breath tests, and evidence handling, and knowing how to file motions and present arguments at a suppression hearing. Most people who represent themselves do not identify the legal problems that could lead to dismissal.
What if the officer did not read me my rights?
Failure to read Miranda rights does not automatically lead to dismissal of a DWI case. It can exclude statements you made to the officer, but it does not exclude the breath or blood test result or observations the officer made. If you made incriminating statements after arrest without being read your rights, those statements can be excluded, but that rarely changes the outcome of a DWI case.
Can a case be dismissed if I refused the breath test?
Refusal itself does not lead to dismissal, but it can help your case. If you refused and the officer drew blood without a warrant or your consent, that blood can be excluded. If you refused and the officer did not draw blood, the prosecution has no chemical test, only the officer's observations and field sobriety tests, which are weaker evidence.