DUI Defense Lawyer San Antonio

DUI Defense in Bexar County — Zero Tolerance Means Zero Margin for Error

Texas Alcoholic Beverage Code §106.041 makes it a Class C misdemeanor for any person under 21 to operate a motor vehicle in a public place with any detectable amount of alcohol in their system. Any detectable amount — not 0.08, not impairment, any amount at all. The charge is a DUI, not a DWI, and it is prosecuted in the Bexar County Courts at Law under a different statute than adult DWI. But it carries a permanent criminal record, license suspension, and an alcohol education requirement that affects employment, college enrollment, and financial aid.

The distinction between DUI and DWI for drivers under 21 depends entirely on the BAC level and the degree of alleged impairment. A driver under 21 with any detectable alcohol but below 0.08 and no sign of impairment faces a Class C DUI. A driver under 21 with a BAC of 0.08 or above, or with signs of impairment regardless of BAC, faces a full Class B DWI charge under Penal Code §49.04 — prosecuted as an adult, same charge as anyone else. The escalation from DUI to DWI can happen at the officer’s discretion based on how the roadside investigation goes.

San Antonio has a large student population. UTSA, St. Mary’s University, Trinity University, Our Lady of the Lake University, and the Alamo Colleges system all generate significant under-21 DUI enforcement activity. SAPD actively patrols the areas around these campuses and the entertainment areas popular with students. A DUI arrest does not have to become a DUI conviction. Call 210-692-4913 immediately.

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DUI vs. DWI in Texas — The Distinction That Changes the Defense

The charge depends on age, BAC, and how the officer characterizes the investigation. Both are defensible — and the defense strategy differs significantly between them.

Charge	Who It Applies To	Standard	Penalty
DUI — Class C MisdemeanorTABC §106.041	Driver under 21	Any detectable alcohol — no BAC threshold	Fine up to $500 • License suspension • Alcohol education • Community service
DWI — Class B MisdemeanorPenal Code §49.04	Any driver (including under 21)	BAC ≥0.08 OR loss of normal use	72 hrs–180 days jail • $2,000 • License suspension • Permanent record
DUI 2nd OffenseTABC §106.041(e)	Driver under 21 with prior	Any detectable alcohol	Increased fine • Extended suspension • IID possible
Minor in Possession (MIP)TABC §106.05	Under 21 with alcohol	Possession in any context	Class C misdemeanor • Fine • License suspension
DUI License SuspensionTexas Transportation Code	Under 21 conviction	First offense	60-day suspension for DUI • Separate from ALR

A Class C DUI conviction, like a Class C assault conviction, creates a permanent criminal record. It is not a traffic ticket — it is a criminal conviction that appears on background checks and can affect financial aid, campus housing, and professional licensing.

DUI defense San Antonio — underage DUI zero tolerance defense and UTSA area enforcement Bexar County courts

After a DUI Arrest in Bexar County — Two Things Happen Immediately

The license suspension clock. A DUI conviction under TABC §106.041 triggers a 60-day license suspension for a first offense on top of any ALR suspension that runs simultaneously. If the DUI is elevated to a full Class B DWI, the 15-day ALR deadline applies the same as any adult DWI arrest — 15 days from the DIC-25 notice to request a hearing with Texas DPS or the license is automatically suspended at day 40. We address both tracks from the first day you call.

The academic and employment consequences. For students at UTSA, St. Mary’s, Trinity, or the Alamo Colleges, a DUI or DWI conviction creates immediate risks beyond the criminal case: FAFSA federal financial aid eligibility can be affected by drug or alcohol convictions; campus housing may be conditioned on a clean criminal record; and professional programs — nursing, education, social work, law enforcement — conduct background checks that a DUI conviction will appear on. We evaluate all of these consequences at the first consultation for student clients in Bexar County."),

The most important action after a DUI arrest in San Antonio is calling us before anything else. Do not make statements about how much you had to drink. Do not consent to additional searches. Write down the specific sequence of events at the stop while it is fresh. Then call 210-692-4913.

DUI defense attorneys San Antonio — Mark Hull and Allison Tisdale defending underage DUI and DWI in Bexar County courts

How We Defend DUI and Underage DWI Cases in Bexar County

DUI and underage DWI defense requires the same systematic analysis as adult DWI — starting with the stop and working through every piece of evidence.

01

Evaluate the traffic stop for Fourth Amendment violations

DUI and DWI arrests begin with a traffic stop that must be legally justified. The specific violation alleged — speeding, improper lane change, equipment violation — must be supported by the dashcam. If the stop lacks legal justification, everything discovered after it is suppressible.

02

Challenge ‘any detectable amount’ on a DUI charge

For Class C DUI charges, the prosecution must prove any detectable amount of alcohol. This is typically done with a preliminary breath test at the roadside or with the certified breath test back at the station. We challenge the device used, whether it was properly calibrated, and whether the operator was certified.

03

Challenge DUI escalation to DWI where it occurred

If a DUI was elevated to a full DWI charge based on the officer’s impairment determination, we examine whether the SFST administration followed NHTSA protocol, whether the video supports the impairment claim, and whether medical or physiological factors explain the observed clues without alcohol.

04

Evaluate dismissal options that protect the academic record

For first-time DUI charges in Bexar County, we evaluate every available path to dismissal that keeps a conviction off the permanent record. A conviction on a Class C DUI is still a conviction. A dismissal followed by expungement is the only outcome that fully protects the student’s background check.

05

Address FAFSA, campus housing, and professional licensing separately

Student clients get a specific evaluation of the non-criminal consequences at the first consultation. Financial aid, campus housing conditions, professional program requirements, and military service eligibility are all evaluated alongside the criminal defense strategy.

DUI Defense in Bexar County — Experience With Student Cases in San Antonio

Mark Hull has 20+ years of Texas criminal defense experience and has defended underage DUI and DWI cases in the Bexar County Courts at Law for over 20 years. The non-criminal consequences of a DUI conviction — financial aid, campus housing, professional licensing — are often more immediately pressing for young clients than the criminal sentence. We address both simultaneously.

Allison Tisdale prosecuted DUI and DWI cases as a Texas state prosecutor before joining the defense. She knows how DA Joe Gonzales’s office handles underage DUI and DWI cases in Bexar County — what it considers a clean stop, what evidence it leans on, and what arguments move these cases toward dismissal. We carry a 5.0 rating across 363 Google reviews and Over 930 dismissals or rejected cases since 2021.

◆ Trial-Tested Criminal Defense

20+ years of Texas criminal defense experience. Bexar, Travis, Williamson, and Hays county courts. Mark Hull.

◆ Former State Prosecutors on Staff

Mark Hull and Allison Tisdale both prosecuted DWI cases. They know how DA Joe Gonzales’s office builds Bexar County DWI prosecutions — and where they fall apart.

◆ 20+ Years in Bexar County Courts

Regular appearances in the Cadena-Reeves Justice Center — Bexar County Courts at Law and District Courts. We know the DWI unit prosecutors and how the docket moves.

◆ Over 930 dismissals or rejected cases since 2021

Bexar County, Hays County, Travis County, and surrounding Central Texas courts.

Over 930dismissal or rejected cases since 2021

5.0Google Rating (363 Reviews)

20+Years in Bexar County Courts

San Antonio DUI FAQ — Bexar County Underage DWI Defense

Questions from young drivers and parents after a DUI arrest in San Antonio — answered honestly.

What is the difference between a DUI and a DWI in Texas?+

Texas DUI under TABC §106.041 applies only to drivers under 21. Any detectable amount of alcohol while driving is enough — there is no BAC threshold and no impairment requirement. It is a Class C misdemeanor. Texas DWI under Penal Code §49.04 applies to all drivers including those under 21. It requires either a BAC of 0.08 or above or loss of normal use of mental or physical faculties. It is a Class B misdemeanor minimum. A driver under 21 can be charged with either or both depending on the BAC level and the officer’s findings.

Can a DUI conviction affect FAFSA financial aid?+

A DUI conviction under TABC §106.041 is an alcohol-related conviction. Federal student aid eligibility rules under the Higher Education Act apply to drug-related convictions; the application of those rules to alcohol-only convictions is more nuanced. However, some scholarship programs, private loans, and university-specific aid require disclosure of any criminal conviction. More immediately, campus housing and certain academic programs conduct background checks that a DUI conviction will appear on. We evaluate all of these consequences alongside the criminal defense on every student DUI case.

Can a DUI be dismissed in Bexar County?+

Yes. A Class C DUI charge in Bexar County is prosecuted in the Bexar County Courts at Law. Like any criminal charge, it is subject to the same Fourth Amendment analysis: was the stop legally justified? Was the breath test or other evidence of alcohol properly collected and documented? Was the officer certified to administer the test? A successful challenge on any of these grounds can lead to dismissal. A dismissed DUI followed by expungement under Texas Chapter 55 is the only outcome that fully protects the permanent record.

Does a DUI count as a DWI on background checks?+

A DUI conviction under TABC §106.041 and a DWI conviction under Penal Code §49.04 are separate offenses. Both appear on criminal background checks. A Class C DUI is reported as a criminal conviction regardless of the fine-only sentence. Most background check databases report all convictions regardless of level. The distinction between the two charges matters for future enhancement purposes — a DUI conviction does not count as a prior DWI for enhancement under §49.09 — but both appear on the public record until expunged.

What happens to my license after a DUI arrest in San Antonio?+

For a Class C DUI conviction, Texas imposes a 60-day license suspension for a first offense and 120 days for a subsequent offense. This is separate from any ALR suspension. If the DUI was elevated to a full DWI charge, the 15-day ALR deadline applies: 15 days from the DIC-25 notice to request an ALR hearing or the license is automatically suspended at day 40. We address both proceedings simultaneously on every Bexar County DUI and DWI case.

My child was arrested for DUI near UTSA. What should we do?+

Call {SA_PHONE} the same day. The student should not make statements about how much they had to drink. The stop, the breath test evidence, and the specific sequence of events all need to be documented and evaluated before the prosecution sets its file. For UTSA students, a DUI also triggers a student conduct process at the university that runs separately from the criminal case — we evaluate both tracks at the first consultation.

DWI Defense Resources — San Antonio & Bexar County

Related pages covering DWI defense in Bexar County courts.

San Antonio DWI Lawyer

DWI defense hub — all charge levels, ALR process, and defense strategy for Bexar County.

BAC & Breath Test Challenges

Intoxilyzer 9000, blood draw chain of custody, and partition ratio challenges in Bexar County.

First-Time DWI Defense

First offense in San Antonio — no deferred adjudication, permanent record, full defense.

DWI Conviction Consequences

Full penalty breakdown for every DWI level — license, record, employment, and CDL.

DUI Defense (Under 21)

Zero tolerance DUI — any detectable alcohol is enough. UTSA and UISD area cases.

Drug Charges Defense

IH-35 / IH-10 drug stop challenges and Fourth Amendment defense in Bexar County.

Expungement San Antonio

Clearing a dismissed DWI permanently under Texas Chapter 55.

San Antonio Criminal Defense

Full criminal defense hub for all charge types in Bexar County courts.

What Our Clients Say

5.0 stars • 363 Google reviews from clients across Bexar County, Hays County, Travis County, and Central Texas.

RL

Ronnicka Lopez

★★★★★

Google

“After two years, the case was dismissed and dropped. They made this whole ordeal easy, kept me in the loop, told me exactly what to expect. Mrs. Allison is such an amazing and sweet lady — the whole team. I see exactly why they received multiple awards for best law firm in the state.”

BS

Blake Shires

★★★★★

Google

“My case was dismissed. Mr. Hull was patient, attentive, and consistently communicative from start to finish. He explained every step and made sure I felt supported throughout. I highly recommend Mark Hull and The Hull Firm.”

SH

Shawn Hallman

★★★★★

Google

“These attorneys were responsive, intelligent, and relentless. I appreciated how they always had a plan and stayed one step ahead. If you’re facing criminal charges, you want them on your side.”

210-692-4913

DUI Defense Lawyer San Antonio — Underage Drinking & Driving in Bexar County

DUI Defense in Bexar County — Zero Tolerance Means Zero Margin for Error

DUI vs. DWI in Texas — The Distinction That Changes the Defense

After a DUI Arrest in Bexar County — Two Things Happen Immediately

How We Defend DUI and Underage DWI Cases in Bexar County

DUI Defense in Bexar County — Experience With Student Cases in San Antonio

San Antonio DUI FAQ — Bexar County Underage DWI Defense

DWI Defense Resources — San Antonio & Bexar County

San Antonio DWI Lawyer

BAC & Breath Test Challenges

First-Time DWI Defense

DWI Conviction Consequences

DUI Defense (Under 21)

Drug Charges Defense

Expungement San Antonio

San Antonio Criminal Defense

What Our Clients Say

DUI Arrest in San Antonio? Call Us Today.