If a person is arrested for DWI in Texas and their breath or blood test came back at .15 or higher, what might have been a Class B misdemeanor is now a Class A, and the district attorney is approaching your case differently than a typical first-time DWI.
A BAC of .15 or above carries enhanced penalties under Texas law, including increased jail time, higher fines, and an ignition interlock requirement on community supervision. Prosecutors know the enhanced charge gives them more leverage at the negotiating table, and they often resist reducing it without a strong legal challenge. Without an attorney who understands how to question BAC evidence, you may be agreeing to a charge that was never fully tested.
At the Law Offices of RJ Harber, we focus on the details that matter in .15 BAC cases—breath tests, blood draws, retrograde extrapolation analysis, and the legality of the initial stop. We know where these cases can be challenged, and we use that knowledge to pursue dismissals, reductions, and favorable trial outcomes. Call today for a free consultation.
The BAC Threshold
Texas defines intoxication in two ways under Penal Code § 49.01: not having normal use of mental or physical faculties because of alcohol or another substance, or having an alcohol concentration of 0.08 or more.
Once a breath, blood, or urine analysis returns a result of 0.15 or higher, Penal Code § 49.04(d) raises the offense from a Class B to a Class A misdemeanor.
The 0.15 figure is a hard line with no built-in discretion. If the lab result hits that threshold, the charge classification changes, and the maximum punishment doubles. Every challenge to the test result, the testing equipment, and the procedure used to obtain the sample carries weight in these cases.
Penalties for a First-Offense .15 BAC DWI in Dallas
Class A Misdemeanor Classification
A standard first-offense DWI in Texas is classified as a Class B misdemeanor. When the analyzed alcohol concentration reaches 0.15 or higher, it is elevated to a Class A misdemeanor without any need for the prosecution to prove additional aggravating facts.
Jail Time and Fines
Under Penal Code § 12.21, a Class A misdemeanor in Texas carries a maximum fine of $4,000 and up to one year in county jail. The Class B classification under § 12.22 caps the fine at $2,000 and the jail term at 180 days. The high BAC enhancement doubles both ceilings.
Court costs, mandatory program fees, and ignition interlock costs typically stack on top of the statutory fine. The 72-hour minimum confinement that applies to a standard first-offense DWI carries forward, but the maximum exposure rises to the full Class A range. That gap is what gives prosecutors leverage in plea negotiations.
Probation Conditions
Most first-offense high BAC DWIs in Dallas resolve through community supervision rather than jail time, but the conditions tend to be heavier than on a standard first-offense DWI. Common terms include monthly reporting, alcohol education classes, victim impact panels, community service hours, alcohol testing, and an ignition interlock requirement on any vehicle the defendant operates. Probation on a Class A misdemeanor can run up to two years.
Enhanced Penalties for Repeat Offenders
When a high BAC reading combines with a prior, the Class A range stays the same, but deferred adjudication becomes unavailable, and the room for negotiation narrows.
A third or subsequent DWI, or a DWI following an intoxication manslaughter conviction, becomes a third-degree felony.
Penal Code § 12.34 sets the range at 2 to 10 years in the Texas Department of Criminal Justice and a maximum fine of $10,000. The high BAC threshold does not enhance the felony, but the lab number can still affect bond conditions, plea posture, and how aggressively the state pursues incarceration over probation.
Administrative License Revocation After Arrest
The Administrative License Revocation process under Transportation Code Chapter 524 runs separately from the criminal DWI case. After an arrest where a breath or blood specimen returns 0.08 or more, the Texas Department of Public Safety initiates a civil suspension of the driver’s license.
Deferred Adjudication Eligibility
Deferred adjudication became available for first-offense DWI in Texas in 2019, but only for cases under the standard Class B classification, excluding a defendant charged under § 49.04 (or § 49.06) whose alcohol concentration was 0.15 or more.
Defenses to a High BAC DWI Charge in Texas
Challenging the Traffic Stop
Every DWI prosecution starts with a traffic stop, and every stop must rest on a particularized legal basis. Depending on the case, the defense might challenge whether there was reasonable suspicion to stop or probable cause to arrest existed.
Challenging Breath Test Calibration and Operator Certification
Texas breath testing relies on instruments maintained and operated under Department of Public Safety rules. Transportation Code § 524.038 lets a certified breath test technical supervisor attest to instrument reliability by affidavit, and § 524.039 lets the defense subpoena the breath test operator and the technical supervisor, which might work as a defense.
Challenging Blood Draw and Chain of Custody
Similarly, blood evidence in a Texas DWI case must follow proper draw protocol and travel through a documented chain of custody from the draw site to the lab to the courtroom. Each link can be contested.
The Rising BAC Defense
Alcohol does not reach peak concentration in the bloodstream the moment drinking stops. There is an absorption window during which BAC is still climbing. If the test is conducted an hour or more after the driving stopped, the BAC at the time of testing may be higher than the BAC at the time of driving.
The legal question under Penal Code § 49.04(d) is the alcohol concentration at the time the analysis was performed. The underlying offense under § 49.04(a) requires the prosecution to prove intoxication while the defendant was operating the vehicle. A toxicologist’s retrograde extrapolation analysis can sometimes show that the actual driving-time BAC was below the 0.15 threshold, even when the test result hit or exceeded it.
Motions to Suppress
A motion to suppress is the formal request to exclude evidence obtained in violation of the Constitution or Texas statutory law. In a high BAC case, suppression targets typically include the stop, the field sobriety tests, the arrest, the Miranda warnings, and the breath or blood draw. Each is a separate legal challenge with its own factual record.
Contact a Dallas High BAC DWI Lawyer
A high BAC DWI charge can often be contested when the test, equipment, or procedure does not hold up to scrutiny. The Law Offices of RJ Harber have experience defending high-BAC DWI cases, with a successful record of reduced charges. Contact us today for a free consultation.
Frequently Asked Questions
Will I lose my license after a high BAC DWI arrest?
A high BAC DWI arrest in Texas triggers a separate civil action against your driver’s license through the Administrative License Revocation (ALR) process. If you fail or refuse a chemical test, the license suspension typically begins 40 days after arrest. Even with a suspension in place, limited driving privileges may be available through an occupational license.
Do I have to install an ignition interlock device for a high BAC DWI?
If your BAC of 0.15 or higher results in a DWI conviction, Texas law generally requires installation of an ignition interlock device on any motor vehicle you drive. Courts may also order the device as a bond condition while the case is still pending, not only after sentencing.