A drug DWI in Dallas often doesn’t come alone. If officers find the substance in the car during the arrest, the driver typically faces a possession charge alongside the DWI—and depending on the drug and the amount, that possession count can be a state jail felony or higher. Two cases, two sets of consequences, filed from the same traffic stop.
The cases don’t always move together. A misdemeanor DWI can be ready for resolution while the possession charge waits on lab analysis, or the felony exposure on the possession count can drive plea negotiations on the DWI in ways the driver doesn’t see coming. Decisions made early on in one case can affect both. Handling them on separate tracks, without thinking through how they interact, is how people end up resolving one case in a way that quietly damages the other.
RJ Harber is a Dallas DWI defense attorney and former prosecutor with over 15 years of experience handling DWI cases stacked with related charges. Whether you’re facing a drug DWI or possession charge, contact us today for a free consultation.
Texas Drug DWI
Under Texas law, a drug DWI includes any case where a driver lacks the normal use of mental or physical faculties because of a controlled substance, a prescription drug, a dangerous drug, or any combination of substances, alone or mixed with alcohol.
Texas has no per se threshold for drugs the way a 0.08 BAC functions for alcohol. Section 49.04(a) makes it an offense to operate a motor vehicle in a public place while intoxicated, regardless of which substance produced the impairment.
Drug DWI penalties in Texas
First Offense
A first DWI is a Class B misdemeanor punishable by up to 180 days in county jail and a fine of up to $2,000. Section 49.04(b) sets a 72-hour minimum confinement that the court cannot waive.
Beyond jail and fines, consequences typically include probation conditions, court-ordered substance evaluation and treatment, community service, license suspension, and, in many cases, an ignition interlock requirement. A separate possession charge from the same stop is its own case.
Second and Subsequent Offenses
A second DWI is a Class A misdemeanor with a 30-day minimum and up to one year in county jail and up to $4,000 in fines under § 12.21.
A third or subsequent DWI becomes a third-degree felony punishable by 2 to 10 years in prison and up to $10,000 in fines.
A prior intoxication manslaughter conviction also triggers third-degree felony treatment on the next DWI.
Drug DWI With a Child Passenger
Under § 49.045, driving while intoxicated with a passenger younger than 15 is a state jail felony, punishable by 180 days to 2 years in state jail and up to $10,000 in fines under § 12.35(a). The age of the child and the operation while intoxicated are the two elements; alcohol or drug levels do not need to reach a specific number.
Drug DWI in a School Crossing Zone
Section 49.04(e) raises a DWI to a state jail felony when the vehicle is operated in a school crossing zone during the hours the reduced speed limit applies. Punishment under § 12.35(a) is 180 days to 2 years in state jail and up to $10,000 in fines.
Drug DWI License Suspension
A drug DWI arrest in Texas triggers a separate civil license action, the Administrative License Revocation (ALR) process, run by the Department of Public Safety. ALR is independent of the criminal case: a charge can be dismissed, and the suspension can still stand if the driver doesn’t act on it. Refusing a blood draw triggers a 180-day suspension or a two-year suspension if the driver has any prior alcohol-related or drug-related enforcement contact within the previous 10 years.
Drugs That Often Lead to a Texas DWI Charge
Illegal Drugs
Controlled substances regulated under the Texas Controlled Substances Act, including cocaine, heroin, methamphetamine, fentanyl, MDMA, LSD, GHB, and synthetic cannabinoids, all qualify as a basis for a drug DWI when they impair a driver’s normal mental or physical faculties.
Prescription Medications
Prescription drugs can support a charge when they cause impairment. Any drug that diminishes normal mental or physical faculties is in scope under § 49.01(2)(A).
Marijuana
Marijuana and THC products, including flower, edibles, vape oil, dabs, and concentrates, qualify as the impairing substance in a drug DWI. Blood THC levels generally do not correlate cleanly with impairment because THC remains detectable well past any impairment window, so the prosecution often leans on officer observations and DRE evaluation alongside the toxicology result.
Defenses to a Texas Drug DWI Charge
Defenses to a drug DWI in Texas usually attack one of three things:
Reasonable suspicion and probable cause: Officers need reasonable suspicion to stop a vehicle and probable cause to arrest. Dashcam, body camera, and dispatch records often show the actual basis for the stop and arrest.
Test reliability and chain of custody: Blood draws require valid consent, a warrant, or exigent circumstances under TTC § 724.012(e). A defense reviews how the blood was drawn, processed, and whether the analyst can tie the reported level to impairment at the time of operation.
Impairment causation: Drug presence is not the same as impairment. The defense can offer alternative explanations for the driving facts and physical signs the officer described (fatigue, medical conditions, anxiety, language barriers, road and weather conditions) and challenge the DRE’s category call against the actual toxicology.
Contact a Drug DWI Lawyer for a Free Consultation
RJ Harber understands all of the consequences a drug-related DWI charge may lead to. He also knows the importance of having an attorney who understands Dallas criminal courts well, so that you have the best chance of having charges dropped or reduced.
If you or a loved one is facing a drug-related DWI charge, contact an experienced lawyer who can build the strongest defense for drug DWI and possession on your behalf. RJ Harber has worked as a criminal defense lawyer for over a decade and has the experience and skill to get you the best result possible. Contact us today for a free consultation.
Frequently Asked Questions
Do edibles count for a DWI in Texas?
Yes. Texas does not distinguish between smoked, vaped, or ingested marijuana for DWI purposes; driving while impaired by THC in any form can support a charge. Edibles DWI cases are increasingly common because edibles take longer to take effect and can cause impairment hours after consumption. Driving after edibles is risky because most people misjudge how long it will impair their ability to drive safely.
Can I be charged with DWI if I wasn’t drinking at all?
Yes. Texas defines intoxication broadly, and a sober DWI charge (drug DWI without alcohol), applies when impairment comes from prescription medication, marijuana, illegal drugs, or even a combination of otherwise legal substances.