DWI vs. DUI in Texas: What’s the Difference? 

If you’ve been stopped by police after drinking, or if your child has been arrested near campus, you may have heard both “DWI” and “DUI” thrown around. Many people assume the two terms mean the same thing. In Texas, they don’t. 

Understanding the difference between a DWI and a DUI in Texas is critical. The charge you face determines the penalties, the court process, and what options may be available to you. Here’s what you need to know. 

The Short Answer: Age Is the Key Distinction 

In Texas, the difference between a DWI and a DUI comes down primarily to one factor: the age of the driver. 

DWI (Driving While Intoxicated): This applies to drivers of any age who are found to be legally intoxicated. This means a blood alcohol content (BAC) of 0.08% or higher, or impairment by alcohol or drugs to the point that normal mental or physical faculties are affected. 

DUI (Driving Under the Influence): In Texas, this is a charge reserved specifically for drivers under the age of 21. Under Texas’s zero-tolerance law, a minor does not need to be legally “intoxicated” (0.08% BAC) to be charged. Any detectable amount of alcohol in their system while driving is enough for a charge. 

DWI in Texas: What the Law Says 

Under Texas Penal Code §49.04, a person commits DWI if they operate a motor vehicle in a public place while intoxicated. “Intoxicated” is legally defined in one of two ways: 

• Having a BAC of 0.08% or higher (the “per se” standard), OR 

• Not having the normal use of mental or physical faculties due to alcohol, a controlled substance, a drug, a dangerous drug, or any combination of those substances 

This means a driver can be charged with DWI even if their BAC is below 0.08%, as long as the officer observes impairment. This is an important and often misunderstood aspect of Texas DWI law. 

First-offense DWI penalties can include: 

• Fine of up to $2,000 

• 3 to 180 days in jail 

• License suspension of 90 days to 1 year 

• Annual surcharge of $1,000–$2,000 for 3 years to retain your driver’s license 

• Mandatory installation of an ignition interlock device in some cases 

Penalties increase significantly for second and third offenses, and can escalate to felony charges if a child is in the vehicle or if someone is seriously injured or killed. 

DUI in Texas: The Minor’s Charge 

Under Texas Alcoholic Beverage Code §106.041, a minor (anyone under 21) commits DUI if they operate a motor vehicle in a public place while having any detectable amount of alcohol in their system. There is no minimum BAC threshold. One drink can be enough. 

A first-offense DUI for a minor is a Class C misdemeanor. Penalties typically include: 

• Fine of up to $500 

• 60-day driver’s license suspension 

• 20-40 hours of mandatory community service 

• Mandatory alcohol awareness course 

• Possible probation 

While a DUI may sound less serious than a DWI, it is still a criminal charge. A conviction can appear on a student’s record, affect scholarships, and create obstacles for employment and professional licensing. 

Can a Minor Be Charged with DWI Instead of DUI? 

Yes, and this is where things get more serious. 

If a driver under 21 has a BAC of 0.08% or higher, or shows clear signs of impairment, Texas law allows prosecutors to charge them with DWI rather than (or in addition to) a DUI. A DWI is a Class B misdemeanor, carrying significantly steeper penalties than a DUI. 

This means a college student or teenager who is noticeably impaired faces the same criminal exposure as an adult driver. The “minor” label does not provide insulation from the more serious charge. 

DWI vs. DUI: A Side-by-Side Comparison 

Who it applies to: 

DWI: Any driver (any age) with BAC ≥0.08% or with impaired faculties 

DUI: Drivers under 21 with any detectable amount of alcohol 

BAC threshold: 

DWI: 0.08% or higher (or any impairment) 

DUI: Any detectable amount (zero tolerance) 

Classification: 

DWI: Class B misdemeanor (first offense); can escalate to felony 

DUI: Class C misdemeanor (first offense) 

Maximum fine (first offense): 

DWI: $2,000 

DUI: $500 

Possible jail time: 

DWI: Yes (3-180 days) 

DUI: Generally, no (first offense) 

What About Drugs? Does That Change the Charge? 

Yes. Both DWI and DUI can be triggered by drugs, not just alcohol. Under Texas law, impairment from prescription medications, marijuana, or illegal drugs can all support a DWI charge, even if no alcohol was consumed and even if the substance was legally obtained. 

Drug-related DWI cases often hinge on officer observations and field sobriety tests, since there is no “breath test” equivalent for most substances. These cases require careful legal analysis, and an experienced defense attorney can challenge the basis for the traffic stop, the reliability of field sobriety tests, and the handling of any chemical testing. 

The Administrative License Revocation (ALR) Process 

When a driver is arrested for DWI or DUI in Texas, two separate processes begin: the criminal case and an administrative license suspension through the Texas Department of Public Safety (DPS). 

If you refuse a breath or blood test, or if you fail one, DPS will automatically move to suspend your license. You have only 15 days from the date of arrest to request a hearing to contest that suspension. 

This 15-day deadline is critical. Missing this means automatic suspension with no hearing. An attorney can request the hearing on your behalf and fight to preserve your driving privileges while your criminal case proceeds. 

Possible Defenses to DWI and DUI Charges 

Being charged with DWI or DUI does not mean the case is closed. There are several legal defenses that an experienced attorney can raise, including: 

• Unlawful traffic stop: Police must have reasonable suspicion to pull you over. If the stop was improper, evidence obtained afterward may be ruled invalid. 

• Improper field sobriety testing: Field sobriety tests must follow strict standardized procedures. Errors in administration can undermine the results. 

• Breathalyzer calibration issues: Breath test machines require regular maintenance and calibration. A faulty or poorly maintained device can produce inaccurate readings. 

• Blood test chain of custody: Blood samples must be collected, stored, and tested properly. Any break in the chain of custody can call results into question. 

• Medical conditions: Certain medical conditions (such as GERD, diabetes, or neurological disorders) can affect field sobriety performance or cause false breath test readings. 

Every case is different. The right defense strategy depends on the specific facts of the stop, the arrest, and the testing procedures used. 

Why You Need a Texas DWI / DUI Defense Attorney 

Both DWI and DUI charges carry consequences that extend well beyond fines and license suspension. A conviction can affect employment, professional licensing, educational opportunities, and your permanent record. For college students and young adults in particular, the long-term stakes are high. 

An experienced criminal defense attorney can: 

• Request an ALR hearing to fight license suspension before the 15-day deadline 

• Review the evidence and identify weaknesses in the prosecution’s case 

• Negotiate for reduced charges or dismissal 

• Pursue deferred adjudication or pretrial diversion where available 

• Protect your record and fight for your future 

At Spiegelhauer Law, we handle DWI and DUI defense in Bryan, College Station, and across Brazos County. We know the local courts, the prosecutors, and the procedures, and we fight hard for our clients at every stage of the process. 

Charged with DWI or DUI in Texas? Don’t Wait. 

The decisions you make in the days immediately following an arrest can shape the outcome of your entire case, and your entire life. Contact Spiegelhauer Law today for a confidential consultation. We’ll review the facts, explain your options, and start building your defense. 

Call us: (979) 450-7250  ||  jake@spiegllegal.com  ||  111 East 27th St Suite 302, Bryan TX 77803 || https://spiegllegal.com/