By Deandra Grant, J.D., M.S. (Pharmaceutical Science), ACS-CHAL Forensic Lawyer-Scientist
The question: What’s the difference between a DWI and a DUI in Texas?
The short answer: In Texas, DWI and DUI are not interchangeable. DWI (Driving While Intoxicated under Penal Code §49.04) applies to adult drivers and requires either a blood alcohol concentration of 0.08 or higher or loss of normal use of mental or physical faculties. DUI (Driving Under the Influence by a Minor under Alcoholic Beverage Code §106.041) applies to drivers under twenty-one and requires only any detectable amount of alcohol. They are different statutes, different elements, different courts in many cases, and dramatically different penalties. The difference matters enormously and confusing the two costs defendants real money and real outcomes.
Here is the longer answer: what each statute actually requires, who gets charged with which, and why a minor caught with alcohol can sometimes also be charged under both.
DWI — Driving While Intoxicated
DWI is the adult intoxication offense in Texas. It is governed by Penal Code §49.04, which makes it a crime for a person to operate a motor vehicle in a public place while intoxicated. “Intoxicated” under §49.01(2) means either:
- (A) not having the normal use of mental or physical faculties due to alcohol, drugs, a controlled substance, or any combination, or
- (B) having an alcohol concentration of 0.08 or more.
DWI is the statute most people think about when they think about “drunk driving.” It applies to anyone of legal drinking age, and it carries the full set of penalties laid out in our first-offense penalties post: jail exposure, fines, license suspension, ignition interlock requirements, and lifetime collateral consequences. A first DWI is a Class B misdemeanor, enhanced to Class A if the BAC is 0.15 or higher under §49.04(d).
DUI — Driving Under the Influence by a Minor
DUI in Texas is a separate statute that applies only to drivers under twenty-one. It is governed by Texas Alcoholic Beverage Code §106.041, which makes it an offense for a minor to operate a motor vehicle in a public place, or a watercraft, while having any detectable amount of alcohol in the system.
The differences from adult DWI are significant:
- DWI requires either a 0.08 BAC or loss of faculties. DUI by a Minor requires only “any detectable amount” which is effectively a zero-tolerance standard.
- A first DUI by a Minor is a Class C misdemeanor, the lowest level of criminal offense in Texas. A first DWI is a Class B misdemeanor, which is significantly more serious.
- A first DUI carries a fine of up to $500, mandatory community service, alcohol awareness courses, and a driver’s license suspension. There is no jail time for a first offense. A first DWI can carry up to 180 days in jail, up to $2,000 in fines, and a longer license suspension.
- DUI cases are typically heard in justice or municipal courts. DWI cases are heard in county or district courts.
- Long-term consequences. Both stay on the record absent expunction or non-disclosure, but the DUI, as a Class C, carries a smaller collateral footprint than the DWI with one important caveat below.
DUI is sometimes described as the “lesser” charge. That is true in terms of immediate punishment. It is not true in every dimension, and a minor charged with DUI should still treat the case seriously.
When a Minor Is Charged with DWI Instead of DUI
A minor under twenty-one can be charged with DWI under §49.04 (not just DUI under §106.041) if the State believes the minor meets the adult intoxication standard. That happens when:
- The minor’s BAC is 0.08 or higher. The per-se prong of §49.01(2)(B) applies regardless of the driver’s age. A minor with a BAC of 0.10 can be charged with adult DWI.
- The minor has lost normal use of faculties. The loss-of-faculties prong of §49.01(2)(A) also applies regardless of age. A minor whose faculties are visibly impaired can be charged with adult DWI even at a lower BAC.
- The State chooses to charge the higher offense. Prosecutors have discretion to charge DWI when the elements are met. They typically do when the case involves a high BAC, an accident, or aggravating facts.
Penalties for DUI by a Minor
A first-offense DUI by a Minor is a Class C misdemeanor punishable by:
- A fine of up to $500.
- Twenty to forty hours of community service. Increased to forty to sixty hours on subsequent offenses.
- An alcohol awareness program. Required to be completed within ninety days.
- A driver’s license suspension. Sixty days for a first offense, with longer suspensions for subsequent offenses.
A second offense increases the penalty range, and a third offense can be enhanced to a higher class of misdemeanor. Repeated DUI offenses by a minor become significantly more serious, both in terms of immediate consequences and in terms of how the offenses affect the minor’s record into adulthood.
Penalties for DWI — Adult or Minor
If a driver of any age is charged with DWI, the penalties under Penal Code §49.04 apply:
- First offense, BAC under 0.15. Class B misdemeanor. Up to 180 days in jail, up to $2,000 fine, license suspension, mandatory minimum 72-hour confinement, possible probation conditions including DWI education, community service, and ignition interlock.
- First offense, BAC 0.15 or higher. Class A misdemeanor under §49.04(d). Up to one year in jail, up to $4,000 fine, mandatory ignition interlock, and additional probation conditions.
- Subsequent offenses. Class A misdemeanor on a second offense, third-degree felony on a third or subsequent offense, with significantly increased exposure.
The financial cost of a DWI (fines, fees, interlock, insurance) generally runs $10,000 to $25,000 or more over the first few years following conviction, before counting any lost wages or professional consequences. The financial cost of a DUI by a Minor is far lower in dollar terms, but the long-term collateral footprint can still be significant.
Driver’s License Consequences — Different for Each
Both offenses carry license consequences, but the structure differs:
- DWI license consequences. Conviction with a jail sentence triggers a suspension under the Texas Transportation Code, separate from any administrative suspension that may have been imposed earlier through the ALR process. Suspensions can range from 90 days to one year on a first offense, longer on subsequent offenses. Conviction where probation is granted does not trigger a suspension on a first offense DWI if the driver education course is completed within 180 days.
- DUI license consequences. A first DUI conviction triggers a sixty-day suspension. Refusal to provide a breath or blood specimen by a minor under twenty-one can also trigger administrative consequences under §106.041 and the implied consent framework.
- Occupational driver’s licenses. Available in either context, with the application process and conditions handled by the court. The Ask Deandra series will cover the ODL/ignition interlock restricted license framework in a separate post.
Loss of driving privileges has cascading effects on insurance, employment, and family life. Both DWI and DUI consequences are worth fighting through ALR or other administrative processes where available.
Why People Confuse DWI and DUI
Texas’s use of distinct DWI and DUI labels is unusual. Many other states use “DUI” as the all-purpose label for any alcohol-impaired driving offense, regardless of the driver’s age. National media coverage of impaired driving uses “DUI” as shorthand. Out-of-state law firms market themselves as “DUI lawyers” even when they handle Texas cases.
The result is widespread confusion in Texas (even among educated drivers) about which statute applies in what situation. Adults sometimes assume “DUI” is what they were charged with. Minors sometimes assume their case is the more serious adult offense. Out-of-state defendants sometimes assume Texas works the way their home state does. None of these assumptions are reliable.
If you are under 21 and not sure what you were charged with, look at the citation, the booking sheet, or the court documents. The cited statute will be either Penal Code §49.04 (DWI) or Alcoholic Beverage Code §106.041 (DUI). The two are not interchangeable, and the wrong assumption can affect your decisions about how to handle the case.
Defending DWI vs. Defending DUI
The defenses to DWI and DUI overlap in some respects and diverge in others:
- Stop and arrest issues are similar. Reasonable suspicion for the stop, probable cause for the arrest, and Fourth Amendment issues apply to both offenses.
- Field sobriety test challenges apply to both. HGN, walk-and-turn, and one-leg stand performance are part of either prosecution.
- Chemical testing differs. DUI typically rests on “any detectable amount,” which is a lower threshold than the 0.08 in DWI. The forensic challenges to instrument calibration, sample integrity, and measurement uncertainty apply differently when the question is detectable presence rather than quantitative concentration.
- Loss of faculties is the DWI prong, not the DUI prong. DUI is per-se. DWI can be charged on either per-se or loss-of-faculties theories.
- Stakes differ. A DUI defense is calibrated to a Class C misdemeanor. A DWI defense is calibrated to Class B or Class A exposure. The level of investment in motion practice, expert witnesses, and trial preparation reflects the stakes.
Both deserve a real defense. Neither should be ignored or pleaded out without legal advice. The collateral consequences of even a Class C DUI for a minor (college disciplinary processes, athletic eligibility, scholarship implications, future employment background checks) can outweigh the courtroom consequences in ways that surprise families.
The Bottom Line
DWI and DUI in Texas are not the same offense and confusing them costs defendants. DWI applies to adults and certain minors, requires either a 0.08 BAC or loss of faculties, and carries jail-level criminal exposure. DUI applies only to minors under twenty-one, requires only any detectable amount of alcohol, and is classified as a Class C misdemeanor with no jail exposure on a first offense. A minor with a BAC at or above 0.08, or with visible loss of faculties, can be charged with DWI rather than DUI. Both offenses deserve defense attention. Both have collateral consequences that follow defendants long after the immediate punishment ends. Knowing which statute applies to your case is the first step in defending it correctly.
DWI and DUI Defense at Deandra Grant Law
Deandra Grant Law defends DWI, DUI, and intoxication-offense cases across North and Central Texas in Dallas, Fort Worth, Plano, McKinney, Frisco, Allen, Lewisville, Denton, Rockwall, and Waco. We handle adult DWI cases and minor DUI cases with the same forensic and procedural rigor, calibrated to the stakes of each case. 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 or your child has been charged with DWI or DUI in Texas, call Deandra Grant Law at (214) 225-7117 or visit texasdwisite.com to schedule a confidential consultation. And remember: 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.