Attorney On Call 24/7

737-937-5786

Free Consultation

IH-35 DWI Defense Lawyer — San Marcos, Kyle & Buda

IH-35 through Hays County is one of the most actively enforced DWI corridors in Central Texas. DPS Troopers, Hays County Sheriff’s deputies, Kyle Police, and Buda Police all run dedicated enforcement along this stretch. The traffic stop that triggered your arrest almost certainly has a dashcam. That video — and what the officer can legally justify before and after it — is where this case gets won or lost. Trial-tested DWI defense. Former Travis County DWI prosecutor on staff. Over 930 dismissals or rejected cases since 2021. Call 737-937-5786.

Free Consultation737-937-5786 — 24/7
✓ 15-Day ALR Filed Day One ✓ 4th Amendment Stop Analysis ✓ Hays County Courts ✓ Available 24/7
Litigator of the Year 2023 — IH-35 DWI defense attorney San Marcos Hays CountyMark Hull
Expertise.com Best DWI Lawyers Hays County — IH-35 corridor DWI defense TexasMark Hull*
National Trial Lawyers Top 100 — DWI defense attorney IH-35 San Marcos Hays CountyMark Hull — 2022
Top 40 Under 40 — Allison Tisdale former prosecutor IH-35 DWI defenseAllison Tisdale — 2022
Lawyers of Distinction — IH-35 DWI defense attorney Hays County TexasMark Hull
Criminal Defense Top 10 — IH-35 corridor DWI defense San Marcos TexasMark Hull

*Based on the quality and quantity of reviews and average minimum rating for a law firm practicing criminal defense in Austin, TX researched by expertise.com

Arrested for DWI on IH-35 in Hays County — Here Is What Actually Happened and What Happens Next

IH-35 through Hays County — from the Travis County line south through Kyle, Buda, San Marcos, and toward Guadalupe County — is a DWI enforcement priority for every law enforcement agency that operates in the county. DPS Troopers run dedicated impaired driving interdiction. The Hays County Sheriff’s Office patrols the unincorporated stretches. Kyle PD and Buda PD work the local frontage roads and feeder streets. San Marcos PD covers the city limits and the Texas State University area. On any given Friday or Saturday night, there are multiple agencies running simultaneous enforcement along this corridor.

The typical IH-35 DWI arrest follows a specific pattern: a minor traffic violation — speeding, improper lane change, following too closely, a lane line touch — gives the officer the legal basis to pull you over. Once stopped, the officer is looking for signs of intoxication: odor of alcohol, watery eyes, slurred speech, open containers. If any of those are present, the traffic stop escalates into a DWI investigation. Field sobriety tests are administered roadside. A breath or blood test follows. The entire sequence is on dashcam and bodycam.

That video is the most important piece of evidence in your case — for both sides. I request it immediately on every IH-35 DWI case because it either confirms the officer’s account or contradicts it. A lane departure that looked deliberate on paper looks completely different on camera when you can see the vehicle maintaining a straight line. A failed field sobriety test performed on uneven highway shoulder in headlight glare, on a windy night, by someone in dress shoes looks different on video than it reads in the report. We find those differences before anything else. Call 737-937-5786 the day of the arrest — the 15-day ALR deadline starts immediately.

  • ✓ Payment Plans Available
  • ✓ Local San Marcos Law Firm
  • ✓ Affordable Fees
  • ✓ Award-Winning Firm
Get a free, confidential case evaluation →

Who Is Running DWI Enforcement on IH-35 Through Hays County

Multiple agencies operate simultaneously along this corridor. Knowing which agency made the arrest — and how they document their stops — is part of building the defense.

Texas DPS — Highway Patrol

DPS Troopers run dedicated impaired driving interdiction along IH-35 through Hays County. They are trained specifically in DWI investigation, operate DIC-24 blood warrant procedures, and document stops meticulously. DPS dashcam footage is typically high quality and preserved through a formal evidence management system. We request it immediately on every DPS arrest.

Hays County Sheriff’s Office

HCSO deputies patrol unincorporated Hays County along IH-35 and the county roads that intersect it — FM-2001, FM-150, FM-967, and others. HCSO operates under DA Kelly Higgins’s prosecution umbrella. HCSO DWI arrests frequently involve longer roadside investigations and are more likely to result in a blood draw warrant than a breath test.

Kyle Police Department

Kyle PD patrols IH-35 through Kyle and the surrounding frontage road network. Kyle has grown significantly — Yarrington Road, Kyle Pkwy, and Center Street are active enforcement zones, particularly on weekends. Kyle PD officers trained in SFST administration are among the most active DWI arrest agencies in Hays County by volume.

Buda Police Department

Buda PD covers IH-35 through Buda and the Main Street / FM-967 intersection areas. Buda is a growing enforcement jurisdiction and has added DWI-trained officers significantly in recent years. Buda PD arrests are prosecuted in the Hays County Courts at Law along with all other Hays County misdemeanor DWI charges.

San Marcos Police Department

SMPD covers IH-35 through San Marcos city limits — including the Texas State University traffic corridors, Hopkins Street, and the Cheatham Street area. Weekend enforcement is concentrated near TSU-area bars and the IH-35 on- and off-ramps. SMPD is a high-volume DWI arrest agency and works closely with DA Kelly Higgins’s office on university-area cases.

Multi-Agency Saturation Patrols

Hays County periodically runs TxDOT-funded DWI saturation patrols — coordinated enforcement nights where multiple agencies deploy additional officers simultaneously along IH-35. These typically occur around holidays, Texas State home football games, and special events. Arrests from saturation patrols follow the same legal standards as any other stop, and the same Fourth Amendment analysis applies.

IH-35 DWI stop defense San Marcos — Fourth Amendment traffic stop challenge and dashcam evidence Hays County courts

The IH-35 Traffic Stop — What the Officer Needed and Whether They Had It

Every DWI arrest on IH-35 begins with a traffic stop. That stop requires reasonable articulable suspicion of a traffic violation or criminal activity. The officer must be able to point to specific, observable facts that justified pulling you over. A hunch, a general instinct, or a desire to check on a driver is not legally sufficient. The observed violation must be a real one.

On IH-35 through Hays County, the traffic violations most commonly cited to justify stops include speeding, following too closely, improper lane change, and what the report will describe as “weaving within the lane” or “touching the fog line.” Each of those has a specific legal definition. Weaving within a lane, for example, does not automatically constitute a traffic violation under Texas Transportation Code §545.060 — the statute requires failing to maintain a single lane “as nearly as practical”, and a single lane touch may or may not satisfy that standard depending on the road conditions, the geometry of the roadway, and what the dashcam actually shows.

I pull the dashcam footage the moment we are retained. I compare the officer’s written description of the driving behavior to what the camera shows. I check the radar or LIDAR calibration records on every speeding-based stop. I examine whether the officer’s body camera was activated at the correct time and whether the recording is consistent with the report. On IH-35 DWI cases, the gap between what the report says happened and what the video shows is often where the defense lives.

IH-35 DWI investigation San Marcos — field sobriety test challenge and BAC evidence defense Hays County

After the Stop — Field Sobriety Tests and the Decision to Arrest

Once stopped, the officer transitions from traffic enforcement to DWI investigation. The field sobriety tests — the Horizontal Gaze Nystagmus (HGN), Walk and Turn, and One Leg Stand — are Standardized Field Sobriety Tests (SFSTs) validated by the National Highway Traffic Safety Administration under specific controlled conditions. On the shoulder of IH-35, those conditions almost never exist.

The IH-35 highway shoulder is not a controlled environment. It is uneven. There is passing traffic at highway speed creating wind and distraction. There are headlights, strobe lights, and flashing overhead signs. The surface is asphalt with seams, cracks, and gravel. Trucks passing at 70 miles per hour create physical air disturbance strong enough to affect balance. The HGN test requires the officer to stand at a specific distance and hold the stimulus at a specific angle for a specific duration — every deviation from the protocol affects the validity of the result.

We examine the SFST administration on every IH-35 DWI case: the officer’s SFST certification and recertification records, the conditions noted in the report versus what the camera shows, and whether the specific clues the officer claims to have observed actually correspond to the protocol as administered. For breath and blood tests following the roadside investigation, we apply the same BAC challenge analysis — Intoxilyzer 9000 maintenance records, partition ratio science, blood draw chain of custody — that we use on every DWI case. More detail on that analysis is on our BAC & Breath Test Challenges page.

The Two Clocks That Start the Moment You’re Arrested on IH-35

An IH-35 DWI arrest in Hays County triggers two separate proceedings on two separate timelines. Missing either deadline has permanent consequences.

⚠ 15-Day ALR Deadline — Your License

When the officer confiscated your license and issued a DIC-25 notice at the scene, the Administrative License Revocation clock started. You have 15 days from the date of that notice to request an ALR hearing with the Texas DPS. Miss that deadline and your license is automatically suspended — 90 days for a first refusal, 180 days for a first failure. No extension. No appeal. No exceptions. We file the ALR request the day you retain us. Call 737-937-5786 today — not tomorrow.

✍ Evidence Preservation Window — Your Case

Dashcam footage from DPS Troopers, HCSO deputies, Kyle PD, Buda PD, and SMPD has agency-specific retention windows — typically 90 days before it can be overwritten unless a litigation hold is requested. Bodycam footage retention varies. Dispatch logs, radar/LIDAR calibration records, and officer scheduling records that establish the officer’s patrol history all need to be preserved through formal requests. The earlier we are retained, the more completely we can build the evidence record before it disappears.

ChargeClassLicense Suspension (Conviction)Key Issue
DWI — First OffensePenal Code §49.04 — BAC ≥0.08 or impairedClass B Misd.90–365 daysNo deferred adjudication • Permanent record
DWI — First Offense, BAC ≥0.15Penal Code §49.04(d) — enhanced blood alcoholClass A Misd.90–365 daysMandatory ignition interlock on conviction
DWI — Second OffensePenal Code §49.09(a) — prior convictionClass A Misd.180 days–2 yearsPrior conviction used for enhancement
DWI — Third Offense (Felony)Penal Code §49.09(b) — two prior convictions3rd Degree Felony180 days–2 yearsPrison range • Felony record
DWI with Child PassengerPenal Code §49.045 — child under 15 in vehicleState Jail Felony180 days–2 yearsChild passenger elevates regardless of BAC
Intoxication AssaultPenal Code §49.07 — serious bodily injury3rd Degree FelonyUp to 2 years (or longer)IH-35 collision with injury • Serious exposure

No deferred adjudication for DWI exists under Texas law at any charge level. A DWI conviction is permanent, cannot be sealed through non-disclosure, and can be used to enhance any future DWI charge regardless of how long ago it occurred.

IH-35 DWI defense attorneys San Marcos — Mark Hull and Allison Tisdale defending DWI arrests on IH-35 in Hays County courts

How We Defend IH-35 DWI Arrests in Hays County

An IH-35 DWI defense has to address three things simultaneously: the ALR deadline, the stop itself, and the evidence. We start on all three the day you call.

01
File the ALR request the day you call

The 15-day administrative license revocation deadline is the first thing we address. We file the ALR hearing request with Texas DPS the day you retain us — no exceptions. The ALR hearing is completely separate from the criminal case and operates on its own timeline. Winning the ALR hearing does not end the criminal case, but losing it costs you your license before trial. Both proceedings get our full attention from day one.

02
Pull every video before it expires

Dashcam and bodycam footage from DPS, HCSO, Kyle PD, Buda PD, and SMPD all have retention windows. We send formal preservation requests immediately on every IH-35 DWI case. Once we have the footage, we compare it frame by frame against the officer’s written report. The differences between what the report says and what the camera shows are where the defense begins.

03
Evaluate the stop for Fourth Amendment violations

Was the traffic violation that justified the stop a real one under Texas law? Was the stop extended past its lawful purpose before signs of intoxication were observed? Did the officer have the legal basis to order you out of the vehicle? A successful suppression motion on the stop ends the DWI case entirely, regardless of what the BAC result was.

04
Challenge the SFST administration

We pull the officer’s SFST certification records and examine every clue on the HGN, Walk and Turn, and One Leg Stand against the NHTSA protocol requirements. IH-35 roadside conditions — passing traffic, uneven shoulders, wind, lighting — are specifically documented and presented as factors affecting the validity of the test results.

05
Challenge the BAC evidence

For breath tests, we examine the Intoxilyzer 9000 maintenance log, calibration records, the officer’s operator certification, and the deprivation period documentation. For blood draws, we examine the chain of custody from the venipuncture to the lab bench, the analyst’s certification, and the testing methodology. Either category of challenge can create reasonable doubt or result in suppression.

06
Engage DA Kelly Higgins’s office with documented arguments

Allison Tisdale prosecuted DWI cases as a Texas state prosecutor before joining the defense. She knows how this office evaluates its IH-35 corridor DWI files, what it considers a clean stop versus a vulnerable one, and what documented suppression arguments create real pressure toward dismissal.

IH-35 Hays County — Key Enforcement Locations We Know Well

Every stretch of IH-35 through Hays County has specific enforcement patterns, patrol agencies, and court jurisdictions. Knowing where your arrest happened tells us a great deal about what the defense looks like.

Kyle — MM 213–220 (roughly)

Kyle PD and HCSO share jurisdiction along IH-35 through Kyle. The Yarrington Road interchange, Kyle Pkwy, and the FM-150 overpass are active enforcement zones. Kyle Municipal Court handles Class C matters; the Hays County Courts at Law at 712 S. Stagecoach Trail handle all DWI charges. Kyle PD uses Intoxilyzer 9000 for breath testing. Blood draws are taken to the Hays County jail or a local hospital.

Buda — MM 219–225 (roughly)

Buda PD covers IH-35 through Buda city limits — the FM-967 interchange and Main Street corridor are common enforcement areas. HCSO also patrols the unincorporated stretches. Buda PD has expanded its DWI-trained officer roster. All DWI charges from Buda go to the Hays County Courts at Law in San Marcos. Buda Municipal Court handles Class C only.

San Marcos — MM 200–213 (roughly)

SMPD and DPS Troopers share the San Marcos stretch of IH-35. Hopkins Street, University Drive, and the Aquarena Springs interchange are active areas. Texas State home football weekends generate the highest DWI arrest volume in the county. SMPD uses the Intoxilyzer 9000. DPS Troopers working this area frequently obtain blood draw warrants under Texas Transportation Code §724.017.

Unincorporated Hays County — HCSO Jurisdiction

Between city limits, HCSO deputies patrol IH-35 and the county road network — FM-2001, FM-1626, US-290 East, and the stretch between San Marcos and the Guadalupe County line. HCSO blood draw warrants are common. Cases go to the Hays County Courts at Law (misdemeanor) or District Courts (felony) at 712 S. Stagecoach Trail regardless of which specific unincorporated area the arrest occurred in.

Why Local IH-35 Corridor Experience Changes the DWI Defense

Mark Hull has practiced criminal defense in Texas for over 20 years. He has defended IH-35 DWI arrests — from Kyle and Buda through San Marcos and the county stretches — in the Hays County Courts at Law and District Courts for over 20 years. Knowing which officers are active on this corridor, how each agency documents its stops, and how DA Kelly Higgins’s office evaluates its IH-35 DWI files is not something you learn from reading a statute book.

Allison Tisdale prosecuted DWI cases as a Texas state prosecutor before joining the defense. She knows how this office builds its IH-35 DWI prosecutions, what it considers a strong case versus one with suppression exposure, and how to position documented legal arguments that move cases toward dismissal. We carry a 5.0 rating across 363 Google reviews and have achieved Over 930 dismissals or rejected cases since 2021 across Central Texas courts, including DWI cases from IH-35 arrests in Hays County.

◆ Trial-Tested Criminal Defense

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

◆ Former State Prosecutor on Staff

Allison Tisdale prosecuted DWI cases as a Texas state prosecutor. She knows how DA Kelly Higgins’s office builds IH-35 corridor cases — and where they fall apart.

◆ 20+ Years on IH-35 Corridor Cases

We have defended DWI arrests from every stretch of IH-35 through Hays County — Kyle, Buda, San Marcos, and the frontage roads. These are our home courts.

◆ Over 930 dismissals or rejected cases since 2021

Across Hays County, Travis County, and surrounding courts — DWI, drug, assault, and felony charges of every level.

Over 930dismissal or rejected cases since 2021
5.0Google Rating (363 Reviews)
20+Years on IH-35 Corridor Cases

IH-35 DWI FAQ — Hays County & San Marcos

Common questions from people arrested for DWI on IH-35 in Hays County — answered with specific Texas law and local court details.

Call 737-937-5786 immediately. Do not speak to law enforcement beyond providing identifying information. Do not post about the arrest on social media. Write down everything you remember about the stop: the specific driving behavior the officer cited, what you said during the stop, the exact location on IH-35, road and weather conditions, and whether you were given a DIC-25 notice. The 15-day ALR deadline to request your license hearing starts today — we file that request the day you call. The dashcam footage from the stop has a retention window. Call us before anything else.

When the officer confiscated your license at the IH-35 arrest scene and issued you a DIC-25 notice, the Administrative License Revocation process began. You have exactly 15 days from the date of that notice to request a hearing with the Texas Department of Public Safety to contest the suspension. Miss that deadline and your license is automatically suspended — 90 days for a first suspension after a failed breath test, 180 days for a refusal. There is no appeal, no extension, and no grace period. The ALR proceeding is completely separate from the criminal DWI case in the Hays County Courts at Law. We file the hearing request the same day you retain us on every IH-35 DWI arrest.

Yes — and we have achieved IH-35 DWI dismissals across Kyle, Buda, San Marcos, and unincorporated Hays County. The most common path to dismissal is through the Fourth Amendment: if the traffic stop lacked reasonable articulable suspicion, the entire DWI investigation that followed is fruit of an illegal stop and the evidence can be suppressed. SFST administration errors, Intoxilyzer 9000 maintenance failures, blood draw chain of custody problems, and BAC challenges also provide grounds for dismissal or acquittal. No deferred adjudication exists for DWI — dismissal or acquittal is the only outcome that protects your record.

Yes — for the defense strategy. DPS Troopers, HCSO deputies, Kyle PD, Buda PD, and SMPD each have different dashcam systems, different body camera policies, different breath testing equipment maintenance records, and different protocols for blood draw warrants. A DPS Trooper is more likely to obtain a blood draw warrant under Texas Transportation Code §724.017 than a local officer. HCSO arrests are more likely to involve extended roadside investigations on unlit county roads. Kyle PD has specific patrol patterns and SFST-certified officer rosters we are familiar with. The arresting agency determines what records we request first.

A refusal has two immediate consequences: the officer will typically seek a blood draw warrant under Texas Transportation Code §724.017 — which courts in Hays County issue routinely for DWI arrests — and your license faces an administrative suspension of 180 days on a first refusal (longer for prior refusals) through the ALR process. The refusal itself can also be introduced as evidence of consciousness of guilt in the criminal trial. However, a refusal does not mean a conviction is inevitable. The Fourth Amendment stop analysis, the blood draw chain of custody, and the lab analysis are all still challengeable regardless of the refusal. We evaluate both the ALR proceeding and the criminal case simultaneously on every refusal case.

Intoxication assault under Penal Code §49.07 is charged when a person by accident or mistake causes serious bodily injury to another person while operating a motor vehicle in a public place while intoxicated. On IH-35, a collision that injures another driver or passenger can trigger an intoxication assault charge rather than a DWI. Intoxication assault is a third-degree felony — 2–10 years in TDCJ and a fine up to $10,000. If two or more people are seriously injured, the charges stack. Intoxication assault cases require the same DWI defense analysis plus a separate evaluation of the collision causation evidence, which is frequently contestable.

No — and this is one of the most important facts about DWI law in Texas. Deferred adjudication is explicitly prohibited for DWI at any level. A DWI conviction is permanent the moment it is entered — it cannot be sealed, cannot be disclosed-ordered away, and can be used to enhance any future DWI charge regardless of how many years have passed. The only outcome that protects your record on a DWI is dismissal or acquittal, followed by expungement under Texas Chapter 55. This is why we pursue dismissal on every IH-35 DWI case rather than accepting a plea.

Misdemeanor DWI charges — first and second offense — are heard in the Hays County Courts at Law at 712 S. Stagecoach Trail, San Marcos, TX 78666. Felony DWI charges — third offense and above, DWI with child passenger, intoxication assault, and intoxication manslaughter — are heard in the Hays County District Courts at the same address. DA Kelly Higgins’s office prosecutes all DWI cases at both levels. The Hays County Adult Detention Center at 1307 Uhland Road in San Marcos is where you are held pending magistration. We appear in all of these courts regularly.

DWI Defense Resources — IH-35 Corridor & Hays County

Related pages covering DWI defense and criminal charges along the IH-35 corridor in Hays County.

San Marcos DWI Defense Hub

Full DWI defense hub — charge types, ALR process, and defense strategy for Hays County.

BAC & Breath Test Challenges

Intoxilyzer 9000 maintenance, partition ratio science, and blood draw chain of custody challenges.

First-Time DWI Defense

First offense DWI — no deferred adjudication, permanent record, and what the defense looks like.

DWI Conviction Consequences

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

Drug Charges Defense

IH-35 drug stops — Fourth Amendment and penalty group defense in Hays County.

Jail Release & Bond

Bond and release after an IH-35 DWI arrest in Hays County — ALR deadline starts at arrest.

Expungement San Marcos

A dismissed DWI can be expunged under Texas Chapter 55 — eligibility evaluation.

Hays County Courts Guide

Guide to the Hays County Courts at Law and District Courts where IH-35 cases are heard.

What Our Clients Say

5.0 stars • 363 Google reviews from clients arrested on IH-35 and across 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.”

Arrested for DWI on IH-35 in Hays County? The Clock Is Running.

The 15-day ALR deadline starts at the moment of arrest. Dashcam footage has a retention window. The stop that led to your arrest may not have been legal. Call our San Marcos DWI defense team at 737-937-5786 — 24 hours a day, 7 days a week.

Free Consultation737-937-5786

For educational purposes only. Not legal advice. Contact us for a free, confidential consultation specific to your case.

1