How Does a DWI Arrest or Conviction Affect a Commercial Driver's License in Texas?
A CDL (Commercial Driver's License) is a federally-issued privilege governed by 49 CFR Part 383. Unlike standard drivers, CDL holders face disqualification under federal regulations even when a DWI occurs in a personal vehicle — not a commercial one. Federal law sets a lower BAC threshold (.04 for commercial vehicles), imposes mandatory disqualification periods, and provides no deferred adjudication relief. The consequences are governed by the FMCSA, not by the state court sentencing outcome. A CDL DWI lawyer Houston commercial drivers trust reviews the federal disqualification tables before advising on plea versus trial strategy. This page covers the CDL-specific rules; for the general Texas DWI process — arrest procedure, court timeline, and penalty ranges that apply to every driver — see the full Houston DWI lawyer overview, and for Harris County court and jail specifics, the Harris County DWI page.
Page last reviewed for accuracy against current FMCSA and Texas Transportation Code provisions: August 2026.
| Offense | 1st Offense | 2nd Offense |
|---|---|---|
| DWI in commercial vehicle (BAC ≥ .04) | 1-year CDL disqualification | Lifetime disqualification |
| DWI in personal vehicle (BAC ≥ .08) | 1-year CDL disqualification | Lifetime disqualification |
| DWI in commercial vehicle w/ hazmat | 3-year CDL disqualification | Lifetime disqualification |
| Refusal to submit to BAC test | 1-year CDL disqualification | Lifetime disqualification |
Texas allows deferred adjudication for first-time DWI in some circumstances — but federal law requires CDL disqualification based on the underlying conduct, not the conviction. Even a deferred adjudication outcome triggers CDL disqualification under federal regulations. This makes winning the case outright — not just the conviction — essential for commercial drivers. Because deferred adjudication offers no protection here, a CDL DWI lawyer Houston drivers depend on treats every CDL case as a must-win trial from the outset.
What Is the BAC Limit for CDL Holders Operating Commercial Vehicles in Texas?
The BAC limit for CDL holders operating a commercial vehicle in Texas is .04 — half the .08 standard limit for personal vehicle drivers. An officer who stops a commercial vehicle and measures a BAC between .04 and .07 can charge a CDL driver with DWI even though the same reading would be legal for a standard driver in a personal vehicle. A CDL DWI lawyer in Houston challenges these borderline BAC readings with particular attention to breathalyzer margin of error. Reviewing the calibration and maintenance logs of the breath testing device is a step every CDL DWI lawyer Houston clients hire takes before trial.
What Is a CDL DWI Lawyer Houston Drivers Trust Defense Strategy?
Because deferred adjudication doesn't protect CDL holders, the only outcome that preserves your commercial license is an outright dismissal or acquittal. A CDL DWI lawyer Houston drivers hire builds toward those outcomes from day one. This win-outright approach is exactly what a CDL DWI lawyer Houston commercial drivers call after an arrest relies on to protect a career, not just avoid a fine.
The 15-day ALR deadline applies to CDL holders. A CDL DWI lawyer in Houston files the ALR hearing request immediately to preserve your right to contest the license action and to gain early discovery of the state's evidence.
Federal regulations require CDL holders to report certain convictions to their employer within 30 days. A CDL DWI lawyer in Houston advises CDL clients on their obligations and timing, and coordinates defense strategy with employment considerations. Coordinating that notice with the criminal case timeline is a service a CDL DWI lawyer Houston clients rely on for both compliance and defense strategy.
Herman addresses both the criminal case and the ALR license suspension simultaneously. The 15-day ALR deadline to contest your license applies to CDL holders the same as any other driver. A CDL DWI lawyer in Houston also challenges the breath or blood test result — because for CDL holders, a .04 BAC reading and a .08 reading require equally rigorous challenges.
CDL DWI Lawyer Houston — Questions
Texas does not allow an occupational CDL — the restricted license available for personal vehicles does not cover commercial vehicle operation. If your CDL is suspended pending an ALR hearing or criminal case resolution, you cannot legally operate a commercial vehicle during that suspension period. A CDL DWI lawyer Houston clients call knows this is why winning the ALR hearing is so critical for commercial drivers. A CDL DWI lawyer Houston drivers turn to for these ALR hearings fights to keep the suspension from taking effect at all.
Yes. Under federal regulations, a DWI conviction — even in a personal vehicle at the standard .08 threshold — triggers CDL disqualification. The CDL is a federal privilege, and federal standards apply regardless of what vehicle you were driving at the time of the offense.
The federal BAC limit for commercial vehicle operation is .04 — half the standard .08 limit. A CDL holder with a .04 BAC while driving a commercial vehicle faces both a CDL violation and potentially a standard DWI charge if other impairment indicators are present. Even a reading as low as .04 can trigger CDL disqualification for a first offense. A CDL DWI lawyer in Houston handles both the standard DWI charge and the CDL administrative action simultaneously.
A first DWI conviction (in a personal or commercial vehicle) results in a one-year CDL disqualification. If the offense involved transporting hazardous materials, the disqualification is three years. A second DWI conviction results in lifetime CDL disqualification. The federal lifetime ban cannot be waived or reduced — making it essential that a CDL DWI lawyer in Houston fight every DWI charge for CDL holders, not just accept a plea.
Yes. Federal regulations treat refusal of a chemical test the same as a DWI conviction for CDL purposes — resulting in a one-year disqualification for a first refusal and lifetime disqualification for a second. Texas ALR also imposes a 180-day administrative suspension for refusal vs. 90 days for failing the test. For CDL holders, whether to take or refuse the test is a critical decision that a CDL DWI lawyer in Houston can help evaluate before any testing occurs, if time permits.
Yes — dismissal or acquittal avoids CDL disqualification entirely. Herman fights CDL DWI cases on the merits: challenging the stop, the field sobriety tests, and the chemical test result. Because the career stakes for CDL holders are so much higher than for non-commercial drivers, Herman treats every CDL DWI with the same intensity as a felony case, regardless of the misdemeanor charge level.
Not automatically — but you have reporting obligations. Federal regulations require CDL holders to report any DWI conviction to their employer within 30 days and to the licensing state within 30 days. Failure to report is itself a violation. Herman advises CDL clients on their exact reporting obligations to avoid compounding the legal problem with a regulatory violation. Getting that guidance quickly from a CDL DWI lawyer Houston families trust can prevent a reporting mistake from becoming a second violation.
The ALR hearing is a civil proceeding that must be requested within 15 days of arrest to contest the administrative license suspension. For CDL holders, the ALR hearing is critical because it is the first opportunity to cross-examine the arresting officer, challenge the stop and test procedures, and build the factual record for the criminal defense. Winning the ALR hearing also prevents CDL suspension before the criminal case is resolved — protecting your livelihood during the case.
CDL disqualification does not automatically revoke your regular driver's license. You may be able to continue driving a personal vehicle (if your regular license is not separately suspended) while your CDL is disqualified. However, the ALR suspension from the DWI arrest may also suspend your regular license — Herman addresses both tracks simultaneously to protect all driving privileges.
A CDL DWI conviction — even a misdemeanor — appears permanently on your driving record and is visible to all employers who run motor vehicle record checks. Most major carriers will not hire drivers with a DWI conviction within the past 5–10 years. A lifetime CDL disqualification from a second DWI ends a commercial driving career entirely. Protecting your record is not just about avoiding jail — it is about protecting your livelihood for decades to come.
What Happens if a CDL Holder’s BAC Is Below .04 But Above Zero?
Federal regulation 49 CFR §392.5(a)(3) creates a third tier below the two thresholds covered above. A commercial driver found to have a blood alcohol concentration between .02 and .039 percent — under the .04 CDL disqualification threshold and far under the .08 standard DWI limit — cannot be charged with DWI or disqualified from operating a commercial vehicle, but must be placed out of service for 24 hours under the same regulation. Texas Transportation Code §644.153 incorporates these Federal Motor Carrier Safety Regulations into Texas law for intrastate carriers, so the same three-tier system — zero tolerance for on-duty use, a 24-hour out-of-service window for .02–.039, and disqualification at .04 and above — applies to Houston-area drivers hauling loads entirely within the state, not only to interstate trucking.
An out-of-service order in this lower range is an administrative roadside action, not a criminal charge, and it does not by itself create a disqualifying event on the CDL record. But the same stop that produces a .02–.039 reading often produces the officer's field notes — odor of alcohol, admissions, performance on field sobriety tests — and those notes can resurface later if a second incident occurs or if the report is used to support probable cause in an unrelated stop. The out-of-service action is also logged with the driver's employer and can influence how a carrier evaluates the driver going forward, even with no citation issued. A CDL DWI lawyer Houston drivers call after a lower-tier BAC stop still reviews the roadside report and pushes to keep any out-of-service notation from being mischaracterized as a DWI arrest on background checks. Because insurers and employers do not always distinguish between an out-of-service action and a real disqualification, a CDL DWI lawyer Houston commercial drivers trust corrects the record before it affects a job application or renewal.