A first DWI in Texas triggers two separate proceedings at the same time. You have 15 days from arrest to request your ALR hearing or your licence is suspended automatically — before your criminal case even reaches a judge.
The fear and uncertainty after a first DWI arrest are real. What happens next, what you need to do immediately, and what is actually at stake for your record and your licence are questions that need answers fast. In Texas, a first DWI is typically a Class B misdemeanor. But that classification tells only part of the story. The criminal charge runs alongside an administrative licence revocation process through the Texas DPS, and the two proceedings operate on completely separate timelines with separate deadlines and separate consequences.
David Smith is Board Certified in Criminal Law by the Texas Board of Legal Specialization and a former Brazoria County prosecutor who served as Chief of the Misdemeanor Division. He prosecuted DWI cases and knows how the state builds them and where they can be challenged.
There are two ways the state proves a DWI. Field sobriety tests and circumstantial evidence, or chemical testing through breath or blood. Neither is as reliable as prosecutors present them to be.
Blood test challenges: Houston police prefer blood tests because they appear more accurate. But a blood test result is only as reliable as the process used to obtain and handle it. Common issues include blood drawn from an incorrect site, samples stored incorrectly, gaps in the chain of custody between the draw and the lab, and testing equipment that was not properly maintained or calibrated. Any one of these issues can undermine the result.
Breath test challenges: Breathalyzers convert breath alcohol into an estimated blood alcohol reading using a formula that assumes a standard physiological profile. Your weight, age, gender, recent food, health conditions, and prescription medications can all affect that result. The device itself must be properly maintained and the test administered in strict compliance with Texas DPS regulations. Where those requirements were not met the results can be challenged.
As part of a DWI sentence or plea agreement in Texas, courts frequently order the installation of an Ignition Interlock Device (IID) , a breath-testing instrument connected to your vehicle’s ignition that requires a clean breath sample before the engine will start. For clients in the Greater Houston area, David Smith Law Firm has arranged access to SmartStart IID services, including a free first month for qualifying clients.
Choosing a reliable IID provider matters. Non-compliance with IID requirements including missed calibration appointments or tampered devices can result in additional criminal penalties or probation violations. SmartStart provides 24/7 support and is available across Houston and Harris County.
