The difference between a first and second DWI arrest in Austin is not just a number. The penalties, the available defenses, the collateral consequences, and the realistic range of outcomes all shift substantially when a prior DWI conviction exists. Understanding what changes — and what doesn't — matters from the moment of arrest.
The Charges: Class B vs. Class A Misdemeanor
A first DWI in Texas (with a BAC under 0.15) is a Class B misdemeanor. A second DWI — regardless of how long ago the first occurred — is a Class A misdemeanor. Texas has no lookback period for DWI enhancements. A DWI from twenty years ago enhances a new charge just as effectively as one from last year.
The classification difference matters in several ways:
- Jail range: Class B carries 72 hours to 180 days; Class A carries 30 days to one year, with the 30 days as a mandatory minimum.
- Fine maximum: Class B tops at $2,000; Class A tops at $4,000. Neither includes court costs, fees, or surcharges, which add thousands more.
- Driver's license suspension: Second offense triggers up to a two-year suspension, compared to one year on a first offense. A prior DWI within five years also adds a six-month mandatory suspension on a new conviction.
The Mandatory Minimum: 30 Days Is Not Optional
The most significant change from first to second offense is the mandatory minimum jail sentence. A person convicted of a second DWI in Texas must serve at least 30 days in jail. This is a statutory minimum — judges cannot reduce it, and it cannot be fully suspended.
In practice, there are ways to serve this time that are less disruptive than a continuous 30-day jail stay. Some Travis County courts allow the mandatory minimum to be served intermittently (weekends, for example) or in alternative facilities. But the requirement itself cannot be waived. This changes the entire negotiation dynamic for second-offense cases.
No Deferred Adjudication for DWI in Texas
Texas is one of the few states that categorically prohibits deferred adjudication for DWI offenses. On a first offense, this fact is significant but less consequential — other options like pre-trial diversion (for eligible first offenders in some counties) or a reduction to obstruction of a highway may be negotiated. On a second offense, the prior conviction often eliminates those alternatives, and the statutory mandatory minimum means that even a favorable plea is constrained.
This is why the quality of the defense — the evaluation of the stop, the field sobriety tests, the breath or blood test procedures — matters more on a second offense, not less. When the plea options are limited by the mandatory minimum, the decision between fighting the case and accepting a plea carries higher stakes.
Ignition Interlock: Required on Second Offense
A second DWI conviction in Texas triggers a mandatory ignition interlock device requirement. The interlock must be installed on any vehicle the person drives, at the person's expense, for at least one year. The device prevents the vehicle from starting if alcohol is detected on the driver's breath and requires periodic rolling re-tests while driving.
Travis County courts may also require an interlock as a condition of bond before the case is resolved — meaning you may be required to install the device immediately upon release from custody, before any conviction.
The ALR Hearing: Still 15 Days, Still Critical
One thing that doesn't change between a first and second DWI is the ALR (Administrative License Revocation) hearing deadline. From the date of arrest (or the date of the officer's notice), you have 15 days to request an ALR hearing with the Texas Department of Public Safety. Missing this deadline means automatic license suspension, typically 90 days to one year depending on whether you submitted to chemical testing.
The ALR hearing is a separate civil proceeding from the criminal case, but it produces discovery — testimony from the arresting officer — that can be valuable in the criminal defense. On a second offense, where the stakes of the criminal case are higher, using every available discovery tool matters more.
What a Prior DWI Does to the Defense
A prior DWI conviction affects the criminal case in ways beyond the enhancement. It affects bail (judges typically set higher bail on second offense), it affects how prosecutors treat plea negotiations, and in some circumstances, it can be admitted into evidence in the trial on the new charge.
The prior conviction also increases scrutiny of any claim that the stop or arrest was improper. When a person has a prior DWI and is stopped again, law enforcement and prosecutors approach the case differently — more thorough documentation, more careful testing procedures. A criminal defense attorney handling a second DWI in Austin reviews the entire chain of custody for the blood or breath test, the officer's qualifications for administering field sobriety tests, and the basis for the stop itself.
When a Second Offense Becomes a Felony
A third DWI in Texas (regardless of when the prior convictions occurred) is a third-degree felony. A second DWI becomes a third-degree felony immediately — with no additional offense required — if a child under 15 was in the vehicle at the time. Intoxication assault (causing serious bodily injury while DWI) and intoxication manslaughter (causing death while DWI) are felonies regardless of the number of prior offenses.
Understanding where a second offense sits in this escalation matters for evaluating the long-term consequences of how the case resolves.
What to Do After a Second DWI Arrest in Austin
The 15-day ALR deadline is the first priority. After that, a criminal defense attorney who handles DWI cases regularly in Travis County evaluates the case — the stop, the field sobriety administration, the chemical testing, the mandatory minimum implications — and advises on the realistic range of outcomes. On a second offense, the gap between a well-handled defense and an unprepared one is wider than on a first offense, because the mandatory minimum removes the ability to minimize consequences through plea alone.