A DWI charge in Texas can be dismissed, and it happens more often than most people arrested for drunk driving expect. An arrest is not a conviction. The state still has to prove every element of its case, and it has to do so with evidence gathered lawfully. Weak facts, procedural mistakes by the arresting officer, unreliable testing, and violations of your constitutional rights can each unravel a prosecution. Whether dismissal is realistic in your case depends on what happened before, during, and after your arrest.
Act Within 15 Days or Lose Your License Automatically
Before getting into the grounds for dismissal, one deadline needs to come first because missing it forecloses options. A Texas DWI arrest triggers two separate cases: the criminal charge, and an administrative license suspension handled by the Texas Department of Public Safety through the Administrative License Revocation program.
You have 15 days from the date you were served notice to request a hearing contesting the suspension. Miss that window and the request is denied; the suspension takes effect automatically on the 40th day after notice, which is usually 40 days after the arrest.1Texas Department of Public Safety. Administrative License Revocation (ALR) Program No grace period, no extension.
The hearing matters beyond the license itself. It forces the arresting officer to testify under oath early in the process, which gives your attorney a preview of the state’s evidence and a chance to pin down testimony that may become useful in the criminal case.
Was the Traffic Stop Legal?
Every DWI case starts with a stop, and an officer needs a legal reason to make one. The standard is reasonable suspicion, which the U.S. Supreme Court in Terry v. Ohio defined as specific, articulable facts that would lead a reasonable person to believe a crime or traffic violation has occurred.2Justia. Terry v. Ohio, 392 U.S. 1 (1968) Running a red light, weaving between lanes, or a moving violation all satisfy that standard. Driving slowly on a weekend night, by itself, usually does not.
When a court finds the officer lacked reasonable suspicion, the stop violated the Fourth Amendment. Under the fruit of the poisonous tree doctrine, everything gathered afterward becomes inadmissible: the officer’s observations, your performance on sobriety tests, and your breath or blood results. In Wong Sun v. United States, the Supreme Court held that evidence obtained directly or indirectly from an unlawful search must be suppressed. Once the evidence is gone, the prosecution rarely has enough to move forward and the case gets dismissed.
One point specific to Texas: the state does not authorize DWI sobriety checkpoints. A 1991 Texas appellate court found roadblocks illegal because no state system authorized them. If you were stopped without an individualized reason at what looked like a checkpoint, that stop was almost certainly unlawful.
Attacking the Sobriety Evidence
Field Sobriety Tests
The three Standardized Field Sobriety Tests, including the walk-and-turn and the one-leg stand, are designed to detect impairment, but their accuracy depends entirely on proper administration. NHTSA publishes detailed manuals specifying exactly how officers should instruct, demonstrate, and score each test.3National Highway Traffic Safety Administration. DWI Detection and Standardized Field Sobriety Testing Participant Manual NHTSA’s own instructor guide acknowledges that variations from ideal conditions “may have some effect on the evidentiary weight given to the results.”4National Highway Traffic Safety Administration. DWI Detection and Standardized Field Sobriety Testing Instructor Guide
In practice, these tests happen on the side of a road, often at night, on uneven pavement, with traffic passing. Medical conditions, injuries, age, weight, and nervousness can all make a sober person look impaired. An officer who gives unclear instructions or skips the demonstration has compromised the test before it starts. Field sobriety tests are voluntary in Texas, and declining them is not evidence of guilt.
Breath Tests
Texas breath testing instruments must be calibrated using certified reference materials traceable to the National Institute of Standards and Technology, and the operator must hold a valid DPS certificate.5Texas Department of Public Safety. Breath Alcohol Program Texas administrative rules also require the operator to remain in the subject’s presence for at least 15 minutes before the test to ensure nothing enters the mouth that could affect the reading. A failure to follow any of these protocols opens the door to a challenge.
The machines themselves can also produce unreliable results. Gastroesophageal reflux disease can push stomach alcohol into the mouth and inflate the reading well beyond actual blood alcohol level. Certain low-carbohydrate diets produce acetone on the breath, which some devices misread as alcohol. Medical interference with breath testing is well-documented in forensic science literature.
There is also the rising blood alcohol defense. Alcohol takes anywhere from 30 minutes to two hours to fully absorb into the bloodstream, depending on food intake, metabolism, and pace of drinking. If your last drink came shortly before driving, your BAC could have been under 0.08 behind the wheel and still climbing during the time it took to complete the stop and administer the test. A toxicologist can often reconstruct the absorption curve to show this.
Blood Tests
Blood draws are generally more reliable than breath tests, but they face their own legal and procedural hurdles. The biggest is the warrant requirement. In Missouri v. McNeely, the Supreme Court held that the natural dissipation of alcohol in the bloodstream does not, by itself, justify a warrantless blood draw in every case. Where officers can reasonably obtain a warrant without undermining the search, the Fourth Amendment requires them to do so.6Justia. Missouri v. McNeely, 569 U.S. 141 (2013) A warrantless draw without valid consent or exigent circumstances is vulnerable to suppression.
Even when the blood was drawn properly, the sample has to be handled correctly. The chain of custody, meaning the documented path from the moment the blood is drawn to the moment it’s tested, must be unbroken. Gaps in documentation, improper refrigeration, contamination, or delays can degrade the sample or call the results into question. Defense attorneys routinely subpoena lab records and maintenance logs to find these issues. When a court excludes the blood evidence, the case often collapses.
Constitutional and Prosecutorial Failures
The Sixth Amendment guarantees a speedy trial, and courts have generally treated delays approaching one year as “presumptively prejudicial.”7Legal Information Institute. Amdt6.3.6 Length of Delay and the Right to a Speedy Trial That presumption is not automatic dismissal. Courts weigh the length of the delay, the reason for it, whether the defendant asserted the right, and whether the delay actually harmed the defense.8Constitution Annotated. Amdt6.2.9 Prejudice and Right to a Speedy Trial When the prosecution drags its feet without explanation and witnesses’ memories fade or evidence disappears, the case can be thrown out.
Prosecutors also have a constitutional duty under Brady v. Maryland to turn over evidence favorable to the defense, whether it relates to guilt or punishment.9Justia. Brady v. Maryland, 373 U.S. 83 (1963) In a DWI case, that often means dashcam or body camera footage showing the defendant speaking clearly, walking steadily, or behaving normally. Withholding that footage is a due process violation and can produce a dismissal.
Inconsistencies between an officer’s written report and their testimony can also gut the prosecution’s case. If the report says you were swaying and slurring but the video shows you standing still and speaking normally, the officer’s credibility is destroyed. Prosecutors know this. When the evidence does not match the narrative, they sometimes dismiss rather than go to trial with a compromised witness.
Negotiated Dismissals and Pretrial Diversion
Not every dismissal comes from a suppression motion. Sometimes the case is weak enough that a defense attorney can negotiate directly with the prosecutor. That may involve dropping the DWI in exchange for a plea to a lesser offense like obstruction of a highway or reckless driving. Neither carries the lasting consequences of a DWI conviction.
Some Texas counties offer pretrial diversion programs for first-time offenders. Eligibility varies by county, but programs typically require no prior criminal history and no accident involving another person. If accepted, you enter an agreement similar to probation, usually lasting six months to two years, with conditions that can include:
- Completing a DWI education or substance abuse course
- A set number of community service hours
- Program fees covering administrative and monitoring costs
- An ignition interlock device installed for part or all of the program period
Complete every requirement and the DWI is formally dismissed. Fail to comply and the original charge returns, in a worse negotiating position than you started.
A Dismissal Does Not Erase the Arrest by Itself
Getting the charge dismissed does not automatically remove it from your record. The arrest still appears on background checks unless you take a separate legal step. Texas offers two options, and the difference between them matters.
An expunction erases the arrest record entirely. Once granted, no one can access it, and you can legally deny the arrest ever happened, including on job applications. If your DWI was dismissed and you were not placed on community supervision or deferred adjudication for the offense, you are generally eligible. For a Class B misdemeanor DWI where no charges were filed, you must wait at least one year from the arrest date. If charges were filed and then dismissed, the court examines the reason for dismissal to decide eligibility.10Justia. Texas Code of Criminal Procedure Title 1, Chapter 55
An order of nondisclosure is more limited. It seals the record from the public but still allows certain government agencies and licensing boards to see it. If you received deferred adjudication for a misdemeanor DWI and completed it successfully, you may petition for nondisclosure after a two-year waiting period, but only if your BAC was below 0.15, no accident involving another person occurred, and you had no prior criminal history beyond minor traffic offenses. Outright convictions carry longer waiting periods and additional restrictions.11Texas Courts. An Overview of Orders of Nondisclosure