Ask Deandra: Can I Get a DWI for Marijuana or Edibles in Texas?

Here is the longer answer: what Texas law actually says about cannabis and driving, what changed for THC products in the summer of 2026, why edibles raise distinct issues, and how a defense addresses cannabis DWI cases.

It also covers what the charge actually carries, how release and the 15-day license deadline work, how long these cases take, what they cost, where they are heard in North and Central Texas, and what can be done about the record afterward.

Texas Law on Cannabis and Driving

Texas’s position on marijuana is more complicated than most national reporting suggests, and it has moved twice in the last eighteen months. Recreational cannabis remains illegal under state law. Possession of even a small amount can support criminal charges under the Texas Health and Safety Code, though prosecution practices vary by county. The state has authorized a medical cannabis program, the Texas Compassionate Use Program, which was significantly expanded in 2025. And the federal government partially rescheduled marijuana in April 2026, which changed less than the headlines suggested.

Start with the Compassionate Use Program, because the 2025 changes made it much larger than it used to be. House Bill 46 took effect September 1, 2025. It replaced the old percentage-by-weight test with a dosage cap: low-THC cannabis now means a product containing not more than 10 milligrams of tetrahydrocannabinols per dosage unit, with a one-gram total THC ceiling per package. It also widened the qualifying conditions well beyond the original short list, adding chronic pain lasting more than 90 days, traumatic brain injury, Crohn’s disease, terminal illness and hospice care to the existing conditions such as ALS, autism, cancer, epilepsy, multiple sclerosis, PTSD, seizure disorders and spasticity. And it permitted product forms the program had never allowed, including prescribed inhalation devices, transdermal patches and suppositories.

The chronic pain addition matters for this page more than any other. It moved a very large group of Texans into a program that had been small and narrow, which means far more lawful Texas cannabis patients are now on the road. None of them are protected from a DWI charge.

On the federal side, the picture changed on April 23, 2026, but not in the way most people assume. The Justice Department placed two narrow categories into Schedule III: marijuana contained in an FDA-approved drug product, and marijuana subject to a state medical marijuana license. Everything else, including bulk and unlicensed marijuana, remains Schedule I. The broader question of moving marijuana generally is still open. A formal hearing ran from June 29 to July 15, 2026, post-hearing briefing closed on August 17, 2026, and no final rule has issued. Product dispensed to a Texas patient through a licensed dispensing organization is likely within the Schedule III category. A recreational user’s cannabis is not.

For DWI purposes, none of it is the point. §49.01(2)(A) defines intoxication as loss of normal use of mental or physical faculties by reason of “alcohol, a controlled substance, a drug, a dangerous drug, a combination of two or more of those substances, or any other substance.” People spend a lot of energy arguing about whether marijuana is technically a controlled substance under Texas law, and the honest answer is that marijuana is defined separately from the penalty groups and prosecuted under its own sections. It does not matter here. The phrase “any other substance” catches everything the argument would leave out. Whether the cannabis came legally from a Colorado dispensary, illegally from a Texas street, or lawfully from a Compassionate Use prescription, the DWI analysis is identical: did it cause loss of faculties at the time of driving?

This is the most important point on this page. “It was legal in the state where I bought it” is not a Texas DWI defense. Neither is “I have a Compassionate Use Program registration.” Both are mitigation arguments, both can shape the case, and neither bars prosecution under §49.04.

The statute says so directly. Texas Penal Code §49.10 provides that in a prosecution for DWI and the other intoxication offenses, the fact that the defendant is or has been entitled to use the substance is not a defense. A valid prescription is evidence, not immunity. It explains why the THC is in your blood, and it can matter a great deal to a prosecutor deciding what a case is worth, but it does not answer the only question §49.04 asks.

What Changed for THC Products on July 31, 2026

If you buy hemp-derived THC products in Texas stores, this section is the one to read, and it is worth checking the date on it. This page reflects the law as of late August 2026, and this particular area has moved several times.

On July 31, 2026, Department of State Health Services rules classifying manufactured THC compounds as Schedule I controlled substances took effect. Delta-8, delta-10, THCP and THCA flower are covered. They are now prosecuted as Penalty Group 2 substances, which means possession of less than a gram is a state jail felony: 180 days to two years and a fine up to $10,000. Products that were on convenience store shelves in June are felony-level in August.

What remains legal to sell is delta-9 THC at or below 0.3 percent by dry weight, to buyers 21 and older. The age limit and the testing, labeling and packaging requirements come from Executive Order GA-56, issued September 10, 2025, and the emergency rules the Department of State Health Services adopted on October 2, 2025.

No statute did any of this. Senate Bill 3, which would have banned consumable hemp THC, was vetoed on June 22, 2025, and the bills filed in the special sessions that followed died. What produced the change was an agency rule from 2021 that had been frozen by an injunction for five years, plus a Texas Supreme Court decision on May 1, 2026 dissolving that injunction. Litigation continues. A state suit was filed in Travis County on August 3, 2026, and in a federal case in the Southern District of Texas the judge declined to lift the ban on August 10, 2026, with the injunction motion still pending. The rules on smokable hemp have been in and out of court separately through 2026 and should be checked as of whatever day you are reading this.

Here is what none of that changed. It was never a DWI defense that a product was legal to buy. §49.01(2)(A) reaches any substance, so a lawfully purchased delta-8 gummy could always support a DWI charge if the State could prove loss of faculties. What changed is the charge riding alongside the DWI. Before July 31, the product in the cupholder was legal merchandise. After July 31, the same product is a felony-level controlled substance, and cannabis DWI arrests are now much more likely to arrive with a possession case attached.

What a Marijuana or Edible DWI Actually Carries

Texas does not treat a cannabis DWI as a lesser charge than an alcohol DWI. It is prosecuted under the same statute and carries the same punishment ladder.

A first offense is a Class B misdemeanor: up to 180 days in county jail and a fine up to $2,000, with a statutory minimum of 72 hours confinement, though first offenders are typically placed on community supervision instead. A conviction also brings a driver’s license suspension and the one-time “super fine” under Transportation Code §709.001.

Read that fine provision carefully, because it is usually described loosely. It is $3,000 for a first conviction within a 36-month period, $4,500 for a second or subsequent conviction within a 36-month period, and $6,000 where the trial shows an alcohol concentration of 0.15 or more. The 36-month window is part of the first two tiers and gets left out constantly. The statute also requires the court to waive the fine on a finding of indigency, which is worth raising if it applies to you.

Two details are specific to cannabis cases, and both favor the defendant. The $6,000 super-fine tier and the Class A enhancement each key to an alcohol concentration of 0.15 or higher. A THC-only case has no alcohol concentration at all, so neither can apply. Those are alcohol-specific enhancements and they do not travel to a marijuana case.

One enhancement that does travel is newer than this page originally was. Since September 1, 2025, DWI committed in a school crossing zone during the hours the reduced speed limit applies is a state jail felony under §49.04(e). It applies no matter what the intoxicant was.

From there the charge escalates exactly as an alcohol DWI does. A prior conviction, a child passenger, a serious bodily injury, or a death moves the case up to intoxication assault or intoxication manslaughter. The intoxicant does not change the ladder. Our DWI penalties guide walks the full range.

Getting Out of Jail After a Cannabis DWI Arrest

Because a first cannabis DWI is a misdemeanor, release usually comes quickly, often on a personal bond or a relatively low cash or surety bond. Bond amounts are discretionary and vary county to county, so treat any figure you read online as a rough range rather than a price. Conditions commonly include abstaining from drugs and alcohol, and in some courts testing to confirm it.

If blood was drawn, expect a wait. THC confirmation testing takes weeks to come back and in many counties months. That delay shapes the case, not your release. You will usually be out long before anyone knows what the blood shows.

One deadline does not wait, and how it works in a drug case surprises people. If you refused to give a specimen, the Texas Department of Public Safety can move to suspend your license through Administrative License Revocation, and you have 15 days from the date of service of the notice of suspension to request a hearing. Miss it and the suspension is automatic.

The part worth understanding is which suspension is even available. There are two tracks. The refusal track does not care what the substance was: refusing a breath or blood specimen supports a suspension of 180 days on a first offense, two years if there is a prior enforcement contact in the preceding ten years. The failure track is different. It requires an alcohol concentration of 0.08 or more, which a THC-only result does not have. So a driver who gave blood and whose blood showed only THC has no license suspension coming out of the test itself. That is a meaningful difference between a cannabis case and an alcohol case, and it is missed often enough that it is worth confirming with your lawyer rather than assuming.

One more mechanical point. If you refused and officers then obtained a warrant and drew blood anyway, the refusal still supports the suspension. The specimen came later and by court order. It does not erase what happened at the roadside.

Request the hearing regardless. It gets you something more useful than the hearing itself: an early, sworn opportunity to question the arresting officer about what they actually observed, months before that testimony has been polished for trial.

Why Texas Has No Per-Se THC Limit

Some states have established per-se THC limits, meaning a specific blood concentration of THC treated as proof of impaired driving. The numeric limits that exist run from about 1 to 5 nanograms per milliliter, and only a handful of states use one. The more common approach among states that legislate on this at all is zero tolerance, where any detectable amount will do. Texas has adopted neither, which means the State cannot win a cannabis DWI case simply by proving that THC was present at any particular concentration.

That sounds like good news for defendants, and in some ways it is. But the lack of a per-se limit also means there is no defined threshold below which the State will concede non-impairment. Officers and prosecutors are not bound by any specific number. If the State can convince a jury that the cannabis caused loss of faculties, at any concentration, including levels that would not produce impairment in many users, a conviction is possible.

The lack of a per-se limit puts every cannabis DWI case squarely on the loss-of-faculties prong. The State has to prove impairment. The defense has to attack the State’s proof. That structure can favor the defense in close cases, and it can hurt the defense in cases where the State can build a strong observational record.

Smoked vs. Vaped vs. Edible Cannabis: Why It Matters

The route of administration matters. Different cannabis products produce dramatically different pharmacokinetic profiles, and that affects how DWI cases involving each are investigated and prosecuted:

• Inhaled cannabis (smoked or vaped). Onset of psychoactive effects is rapid, within minutes, and subjective peak effects typically arrive 20 to 45 minutes after use. Effects generally wane over two to three hours, though residual effects can persist longer. Blood THC behaves differently from the high: it peaks essentially at the end of inhalation and then falls fast, often dropping below the levels associated with impairment within about two hours, while the user still feels the effects.
• Edible cannabis. Onset is dramatically slower, roughly 30 minutes to two hours, because the THC has to be processed through the digestive system and the liver, and the peak arrives later still, often two to four hours after eating. Effects can be more intense and longer-lasting than inhaled cannabis, often persisting six to eight hours or longer. The slow onset is itself a frequent cause of overconsumption: users who do not feel effects within an hour take a second dose and then face the cumulative effects of both doses simultaneously.
• Sublingual or oral mucosal products. Tinctures, sprays, and dissolving products produce intermediate onset and duration profiles, depending on the formulation.

From a forensic perspective, edibles produce a different defense landscape than inhaled cannabis. The slow onset and long duration mean that an edible user can have substantial THC effects hours after consumption, with corresponding blood levels. The defense of “I ate it before lunch and was driving home from dinner” is not the alibi some users believe it to be, because edible effects can still be present at dinner.

The Metabolite Problem

This is the single most important forensic issue in cannabis DWI cases, and the one most defendants and most generalist lawyers misunderstand.

THC (delta-9-tetrahydrocannabinol) is the primary psychoactive cannabinoid in cannabis. It is the substance that produces impairment. The body metabolizes THC into other compounds, including 11-hydroxy-THC, which is also psychoactive, and 11-nor-9-carboxy-THC, often called carboxy-THC or THC-COOH, which is not.

The forensic problem is that carboxy-THC, the non-psychoactive metabolite, is fat-soluble, stored in body fat, and slowly released back into the bloodstream over a very long tail. The persistence is better documented than most people expect. In a study of chronic daily users kept under continuous monitoring, carboxy-THC was still detectable in the blood of four of five participants at 30 days, and parent THC itself was still detectable in two of five (Bergamaschi and colleagues, Clinical Chemistry, 2013). A blood test showing carboxy-THC proves cannabis use at some point in the past. It does not prove use today, and it does not prove impairment at the time of driving.

This matters enormously for cannabis DWI cases. A regular cannabis user who has not used in days or weeks can still test positive for carboxy-THC and may even have detectable low-level active THC with no impairment whatsoever. The State has to prove impairment at the time of driving, not historical use. The defense has to make sure the science of metabolite persistence is explained clearly to the jury.

There Is No Retrograde Extrapolation for THC

In an alcohol case, the State often tries to bridge the gap between the time of driving and the time of the blood draw using retrograde extrapolation, working backward from the tested result to estimate what the concentration would have been behind the wheel. The technique rests on the Widmark model and on alcohol’s relatively orderly absorption and elimination.

None of that transfers to THC. Cannabis does not follow that curve. THC distributes rapidly into fat, is released back into the blood unpredictably, and declines in a pattern nobody can reliably run in reverse. There is no accepted retrograde extrapolation for THC, which means the State cannot legitimately take a blood level drawn two hours after the stop and tell a jury what the level was at the moment of driving. When a State witness starts drifting toward that kind of estimate, it deserves a hard look and often a hearing outside the presence of the jury.

How the State Builds a Cannabis DWI Case

Without a per-se threshold, cannabis DWI prosecutions rest on a combination of evidence:

• Driving behavior. The State will emphasize any unusual driving such as weaving, slow reactions, missed traffic signals or accidents.
• Officer observations. Bloodshot eyes, the odor of cannabis on the person or in the vehicle, slow speech, dilated pupils, slow reactions to officer commands.
• Defendant statements. Admissions about cannabis use, often elicited through the same casual-conversation interrogation techniques covered in our post on answering the officer’s questions.
• Cannabis paraphernalia or product in the vehicle. Pipes, vape pens, edible packaging, leftover product. These corroborate use but do not establish timing of use, and since July 31, 2026 some of them are their own charge.
• Field sobriety test performance. Standardized field sobriety tests were developed and validated against alcohol, not cannabis. Officers are trained to apply them anyway, and to score “clues” the same way they would in an alcohol case. The protocol mismatch is itself defensible territory, and there is more on it below.
• DRE evaluation. Drug Recognition Evaluators apply a twelve-step protocol designed to identify drug-induced impairment by category. Cannabis is one of the seven drug categories DREs are trained to recognize. The reliability of the protocol, particularly for cannabis, is contestable.
• Blood toxicology. Confirmatory testing for THC, 11-hydroxy-THC, and carboxy-THC. Reported concentrations of each can be developed forensically.

None of these is conclusive on its own. Together, they can build a case the State can win. Which is why every piece is contestable, and why the defense has to address each one.

The DRE numbers deserve a closer look than they usually get, because the field studies and the laboratory studies do not agree, and that gap is itself the cross-examination. When Oregon evaluators re-read redacted case files, they named cannabis as the drug category 81 percent of the time (Smith and colleagues, Forensic Science International, 2002). In controlled laboratory dosing studies, agreement between DRE drug-class opinions and toxicology fell to between 32 and 44 percent (Heishman and colleagues, Journal of Analytical Toxicology, 1996 and 1998). And in a 2022 dosing study, a DRE-conducted expanded evaluation classified THC impairment with about 68 percent accuracy but a positive predictive value near 35 percent, meaning most of the people it called impaired were not (Gilman and colleagues, Neuropsychopharmacology, 2022). A DRE opinion is an opinion with a documented error rate, and it should be cross-examined as one. Our guide to DRE science and its limitations goes deeper.

The Innocent Explanations the Officer Left Out

Bloodshot eyes. Dry mouth. Elevated pulse. Dilated pupils. Every one of these appears in cannabis DWI reports as evidence of impairment, and every one of them has ordinary explanations that have nothing to do with cannabis.

Allergies and contact lenses redden eyes, and so does a long shift, a short night, or crying. Dozens of common medications cause dry mouth. Pulse rises with anxiety, and being investigated on the roadside makes almost everyone anxious. Pupil size responds to ambient light, to the flashlight the officer is holding, and to a long list of lawful substances. Officers are trained to record the observation, not to rule out the alternatives. Putting those alternatives in front of a jury is core defense work.

The odor question deserves its own treatment, and it deserves an honest one, because it is the single most oversold argument in Texas cannabis defense. The scientific premise is sound. Since Texas legalized hemp in 2019, the smell of cannabis no longer distinguishes a legal product from an illegal one. Hemp and marijuana smell alike because chemically they largely are alike, separated by a THC threshold no nose can measure.

Texas appellate courts have not been persuaded. Every Texas court of appeals to reach the question has held that hemp legalization did not destroy odor-based probable cause. Dallas reversed a suppression order on exactly this reasoning in State v. Gonzales in 2023, holding that officers are not required to be certain that what they smell is marijuana rather than hemp, because probable cause has never demanded certainty. San Antonio, Tyler and Amarillo have gone the same way, most recently in Parras v. State in 2025. Texas is an outlier nationally, as several other states’ high courts have gone the other direction, and that is worth knowing but it does not decide a Texas case. The Court of Criminal Appeals has not resolved the question, and when it had a cannabis search case in front of it in 2025 it expressly set the hemp evidence aside.

So the honest advice is that odor alone is not the winning argument in Texas that it is elsewhere, and any lawyer who tells you otherwise has not read the cases. What still works is narrower, and it is where the litigation should go: whether the officer had anything beyond the odor, whether the detention lasted longer than the reason for it justified, and whether the search itself crossed a line the Fourth Amendment draws independently of what anyone smelled. The 2025 case is a good illustration of the last one. The Court of Criminal Appeals affirmed suppression in State v. Organ because a drug dog’s nose repeatedly crossed the plane of an open car window, which was a physical intrusion into the vehicle and therefore a search, regardless of what the dog detected.

Forensic Defense in a Cannabis DWI Case

Cannabis DWI defense is forensic-heavy work. The categories that matter:

• The metabolite distinction. Carboxy-THC proves past use, not impairment at the time of driving. Defense expert testimony on this point is often the most important testimony in a cannabis DWI trial.
• Pharmacokinetics of THC redistribution. THC stored in body fat can be released back into the bloodstream during exercise. This one is worth stating carefully, because it is routinely overstated. One study of regular users found a small rise after 35 minutes of cycling that tracked with body mass index, with no change from fasting (Wong and colleagues, Drug and Alcohol Dependence, 2013). A replication attempt using longer exercise and a 24-hour fast found a mean increase of roughly 25 percent that was gone within two hours, and those authors concluded the effect was unlikely to change how a test should be interpreted (Westin and colleagues, Basic and Clinical Pharmacology and Toxicology, 2014). It is a fair question to put to the State’s expert. It is not a defense standing alone, and a well-prepared prosecutor will have read the same replication.
• Tolerance. Chronic cannabis users develop pharmacodynamic tolerance. The same blood concentration produces less subjective and behavioral effect in a chronic user than in a naive user. State arguments built on a static dose-response relationship ignore this well-documented phenomenon.
• DRE reliability. The twelve-step protocol includes several elements that are subjectively scored and several with documented reliability problems. Cross-examination of the DRE on training, scoring, and the specific findings is routine defense work.
• SFST mismatch. The evidence here is stronger than a general complaint about validation. Horizontal gaze nystagmus is the clearest example: cannabis does not generally produce it, and in one study of 309 THC-only subjects, 78.6 percent showed no HGN clues at all (Declues and colleagues, Journal of Forensic Sciences, 2016). For edible cases specifically, a controlled study found that oral THC impaired on-road driving performance while the field sobriety battery failed to distinguish dosed drivers from sober ones at all (Bosker and colleagues, Addiction, 2012). And the largest recent study found a serious false-positive problem: officers rated 49.2 percent of placebo subjects as impaired, and of everyone they classified as impaired, they suspected THC in 99.2 percent (Marcotte and colleagues, JAMA Psychiatry, 2023). Those authors concluded the tests, without more, may be insufficient to establish THC-specific impairment.
• Timing. When was the cannabis consumed? When was the blood drawn? What does the pharmacokinetic profile of that route of administration suggest about likely impairment at the time of driving?
• The stop itself. Texas Code of Criminal Procedure Article 38.23 requires the exclusion of evidence obtained in violation of the law. If the stop lacked reasonable suspicion, or the search or blood draw lacked probable cause and a warrant or valid exception, the blood result and everything downstream of it can go with it. In cannabis cases, as the odor discussion above explains, the productive version of this argument is about scope and duration and physical intrusion rather than about smell by itself.

These are not arguments a generalist DWI lawyer typically makes. They require pharmacology training, willingness to retain forensic experts, and comfort with cross-examination on scientific evidence. They are also arguments that change cannabis DWI outcomes when made well.

Edibles Specifically: The Cases That Surprise Defendants

Edible-related cannabis DWI cases have a distinct pattern that catches users off guard:

• Delayed onset miscalculation. Users consume an edible, do not feel effects within an hour, take a second dose, and find themselves under the cumulative influence of both doses an hour or two later. By the time they decide to drive, they may believe they are past it, and then the THC arrives.
• Long duration miscalculation. Users consume an edible at noon, drive home from a friend’s house at midnight, and are surprised to be charged based on substantial blood THC levels persisting twelve hours later.
• Dose unpredictability. Homemade edibles, products from unregulated sources, and even some commercially produced edibles can have THC concentrations that differ substantially from the labeling. Users dosing on the basis of expected effects can substantially underestimate actual exposure.
• Combination with alcohol. Edible users who pair the experience with alcohol compound the effects of both. The statute anticipates this directly: §49.01(2)(A) reaches a combination of two or more substances, so the State does not have to prove that either one would have been enough on its own.

Edible DWI cases often involve relatively responsible users who simply misjudged the timing or strength of the dose. They also tend to involve substantial blood THC concentrations that can be hard to defend without expert testimony on edible pharmacokinetics.

A Marijuana DWI Is Not Marijuana Possession

These two get conflated constantly, including by people facing both. They are different offenses, with different elements and different defenses.

Marijuana possession lives in the Health and Safety Code and turns on the substance itself: what you had, how much, and in what form. A marijuana DWI lives in Penal Code §49.04 and turns on driving while impaired. How much you possessed is beside the point. You can be charged with possession without ever getting behind the wheel, and you can be charged with a marijuana DWI when officers find no usable cannabis at all, because the allegation is about cannabis consumed earlier.

The “in what form” part catches edible users hardest, and it is the reason edible cases so often arrive with a felony riding alongside a misdemeanor. Texas treats THC concentrates and edibles as Penalty Group 2 substances rather than as marijuana, and the weight that controls the charge is the aggregate weight, including adulterants or dilutants. In an edible, the flour, butter and sugar are the dilutants. So a batch of brownies is charged by the weight of the brownies rather than by the THC in them. Under a gram is a state jail felony; a gram to four grams is a third-degree felony. A few ordinary brownies clear four grams without difficulty. Since July 31, 2026, delta-8 and similar manufactured products sit in that same Penalty Group 2 bucket.

The practical consequence is that beating one does not beat the other. They are litigated separately, and how you resolve one can have consequences in the other.

Practical Guidance for Cannabis Users in Texas

If you are going to consume cannabis in Texas, whatever the legal source, the practical guidance is straightforward:

• Be especially careful with edibles. Onset is slow, peak is delayed, and duration is long. Hours after consumption is not the same as “the high is over.”
• If stopped, follow the same playbook as any DWI stop. Pull over safely, identify yourself, decline questions about consumption, decline field sobriety tests, request a lawyer, and stop talking. The advice in our post on what to do when you are pulled over applies.
• If asked for a blood specimen, understand the consequences. The decision and what follows from it are addressed in our post on refusing a breath test. The same framework applies to blood draws, with the license-suspension wrinkle described above.

If You Have Been Charged with Cannabis DWI

Several immediate considerations:

• Hire a defense lawyer with forensic and pharmacological expertise. Cannabis DWI is forensic-heavy and benefits enormously from counsel comfortable with the science.
• Address the ALR deadline. The 15-day administrative license deadline runs from the date of service of the notice of suspension.
• Preserve any evidence of when cannabis was consumed. Receipts, packaging, witness testimony, communications. Anything that establishes timing can support the defense.
• Be cautious with social media. Cannabis-related posts have appeared at trial in cannabis DWI cases. Stop posting about the case, the night in question, or anything that could be read as an admission.
• Do not assume the case is unwinnable because the test was “positive.” Positive is not the same as impaired. The metabolite distinction, the timing analysis, and the pharmacokinetic considerations make many cannabis DWI cases more defensible than the initial test result suggests.

How Long a Cannabis DWI Case Takes

Most cannabis DWI cases run somewhere between nine and twenty-four months, and blood cases sit at the longer end. The bottleneck is toxicology. Confirmation testing for THC, 11-hydroxy-THC, and carboxy-THC takes far longer to return than a breath result, and lab backlogs are not something anyone in the courtroom controls.

Slower is usually better here. That waiting period is exactly when the defense work happens: obtaining the underlying lab data rather than the one-page report, having an expert review the chromatography, and building the timeline between consumption and driving. A case resolved before the blood work is properly examined is a case resolved before anyone knows what it is worth.

What a Cannabis DWI Defense Costs

It depends on the county, on whether the case involves blood toxicology, on whether an independent forensic expert is needed, and on whether the case resolves before trial. Cannabis cases tend to require more expert involvement than alcohol cases. That is a real cost, and it is also the reason they are so often more winnable.

We quote a flat fee after a free consultation, so you know the number before you commit. Weigh it against what a conviction costs over the years that follow: the fine, the $3,000 super fine, the license suspension, the insurance increase, and a record that cannot be erased once the conviction is final.

Ask up front what the fee covers, because the expert work that wins cannabis cases is sometimes billed separately, and ask about payment plans if the number is the obstacle.

Where Cannabis DWI Cases Are Heard

Cannabis DWI cases follow the same venue map as any other Texas DWI. Misdemeanors go to the county criminal courts and felony-level intoxication offenses to the district courts. In Dallas County both sit in the Frank Crowley Courts Building; Tarrant County cases run through the Tim Curry Criminal Justice Center; and Collin, Denton, Rockwall, and McLennan County cases go to their respective county courts.

For the suburban and Central Texas courts, see the Plano, Carrollton, and Waco DWI pages.

Local practice matters more in drug cases than most people expect. Counties differ in how aggressively they pursue cannabis DWI, in which lab handles their toxicology and how backed up it is, and in whether the prosecutor’s office has anyone who understands the metabolite distinction well enough to evaluate a case honestly. We appear in these courthouses every week. See DWI enforcement across North Texas for how the counties differ.

Local knowledge is a real advantage in a cannabis case. Whether your DWI lawyer needs to be local explains where it matters and where it does not.

The Long-Term Consequences of a Cannabis DWI Conviction

A cannabis DWI conviction is a DWI conviction. It is not recorded as something lesser or drug-specific, and it carries the same weight.

• Your record. A DWI conviction cannot be expunged once it is final. Expunction destroys records and is reserved for cases that ended in acquittal, dismissal or certain no-bills. That is the strongest reason to fight the case now rather than take a quick resolution. Sealing is a different question and is covered in the next section.
• Your license and insurance. The same suspension applies, and the same SR-22 filing requirement follows.
• Federal and professional exposure. This is where cannabis cases still diverge from alcohol cases, though less starkly than they did before April 2026. Recreational marijuana remains a Schedule I controlled substance federally. The April 2026 order moved only FDA-approved marijuana drug products and marijuana subject to a state medical marijuana license into Schedule III, and broader rescheduling is still pending. A cannabis-related conviction can therefore still carry extra weight in professional licensing decisions, federal employment, and security clearance reviews in ways an alcohol DWI does not.
• Future cases. The conviction counts as a prior for any later DWI, whether that later case involves alcohol or drugs. It raises the floor on everything that comes after.

Clearing the Record After a Marijuana DWI

Expunction and sealing are two different remedies and they get used interchangeably in conversation, which costs people real opportunities. A DWI conviction cannot be expunged. But it can sometimes be sealed through an order of nondisclosure, and there is a quirk in the statute that works in favor of cannabis defendants specifically.

The DWI nondisclosure statutes exclude anyone whose offense was punishable under §49.04(d), the 0.15 enhancement. That subsection keys to an “alcohol concentration” of 0.15 or more. In a THC-only case there is no alcohol concentration to show, so the exclusion cannot be triggered no matter how high the THC level was. A marijuana DWI is, in that narrow sense, a better nondisclosure candidate than an alcohol case with the same facts.

Which statute applies depends on how the case resolved, and the waiting periods are different in each:

• Community supervision after conviction. Government Code §411.0731. Two years after completing supervision if an ignition interlock was a condition for at least six months, five years if it was not.
• A sentence served rather than probation. Government Code §411.0736. Three years after completing the sentence with the same six-month interlock condition, five years without it. This is the one most often misquoted, because people apply the two-year probation figure to a case that was never on probation.
• DWI deferred adjudication. Government Code §411.0726. Two years after the deferred adjudication is completed and the case is discharged and dismissed, with no interlock condition required.

Two gates apply across all three. The State can defeat the petition by showing the offense involved a motor vehicle collision with another person, including a passenger in your own car. And the applicant must have no prior conviction or deferred adjudication for anything other than a fine-only traffic offense.

Nondisclosure is not erasure. Law enforcement and a defined list of licensing agencies can still see a sealed record. But it removes the conviction from ordinary background checks, which is what most employers and landlords run. If your case is heading toward a plea, this is a conversation to have before the plea rather than years afterward, because whether an interlock condition goes into the order can move the wait by three years. Our guide to how long a DWI stays on your record covers the timeline in full.

The Bottom Line

You can be charged with DWI in Texas based on marijuana, smoked, vaped, or eaten as an edible, even where the cannabis is legal under another state’s law or under the Texas Compassionate Use Program. Texas has no per-se THC limit, which means these cases turn on whether the State can prove loss of faculties at the time of driving. The metabolite distinction, the absence of any reliable retrograde extrapolation for THC, the tolerance phenomenon, and the documented limitations of field sobriety tests and DRE evaluations for cannabis all create defensible territory, but only for a defense lawyer who understands the science. And if the case does resolve in a conviction, the sealing analysis is often better in a THC case than in an alcohol case. For how the State builds any drug case see how Texas police prove a drug DWI, and for cases built on prescribed medication rather than cannabis see prescription medication DWI. Roadside THC screening devices are covered on roadside cannabis testing.

Frequently Asked Questions

Can I get a DWI in Texas from a legal hemp gummy?

Yes. The DWI statute reaches “any other substance,” so whether a product was legal to buy has never been the question. The question is whether it caused loss of normal use of your mental or physical faculties while you were driving.

Does my Compassionate Use Program prescription protect me?

No. Penal Code §49.10 says entitlement to use a substance is not a defense to an intoxication offense. Your prescription explains why the THC is in your blood, and it can matter to a prosecutor evaluating the case, but it does not bar the charge.

Will I lose my license if my blood shows only THC?

Not from the test itself. The failure-based suspension requires an alcohol concentration of 0.08 or more, which a THC-only result does not have. A refusal is different: refusing a breath or blood specimen supports a 180-day suspension on a first offense regardless of what the substance was, and you have 15 days from service of the notice to request a hearing.

How long does THC stay in your blood?

Longer than the impairment does, which is the whole problem. Active THC falls quickly after inhalation, but in chronic daily users both carboxy-THC and low levels of parent THC have been detected in blood a month after last use. A positive result is proof of use, not proof of impairment at the time of driving.

Can a marijuana DWI conviction be sealed?

Often, yes. Because the 0.15 exclusion in the nondisclosure statutes keys to alcohol concentration, a THC-only case cannot be excluded on that basis. The waiting period depends on whether the case ended in probation, a sentence, or deferred adjudication, and on whether an ignition interlock was a condition.

Will I be charged with possession too?

More often than before. Since July 31, 2026, delta-8, delta-10, THCP and THCA products are Penalty Group 2 controlled substances in Texas, and edibles are weighed as a whole product rather than by their THC content. That combination turns a small amount of edible into a felony-level possession charge alongside the misdemeanor DWI.

Marijuana DWI Defense at Deandra Grant Law

Deandra Grant Law defends DWI and intoxication-offense cases across North and Central Texas including Dallas, Fort Worth, Plano, McKinney, Frisco, Allen, Lewisville, Denton, Rockwall, and Waco. We handle cannabis DWI cases with the forensic and pharmacological depth they require by challenging metabolite-versus-impairment claims, addressing the THC redistribution literature honestly, cross-examining DREs on protocol reliability, and litigating the loss-of-faculties standard at the level the science demands. Our team includes an ACS-CHAL Forensic Lawyer-Scientist with a Master of Science in Pharmaceutical Science and a Graduate Certificate in Forensic Toxicology.

If you have been charged with DWI in Texas based on marijuana, edibles, or any cannabis product, call Deandra Grant Law at (214) 225-7117 or visit texasdwisite.com to schedule a confidential consultation. And remember that the 15-day ALR deadline runs from the date of service of the notice of suspension.

Have a DWI question you want answered in this series? Submit it at texasdwisite.com. You might see it featured in a future Ask Deandra post.