Texas DWI testing begins before the laboratory number
Texas Transportation Code Chapter 724 addresses implied consent, requests for breath or blood specimens, refusals, warrants or exigent circumstances, qualified specimen collection, access to analysis information, and administrative-license consequences. The legal path used to obtain a specimen matters independently from what a later analysis reports.
A complete defense review asks whether the stop and arrest were lawful, what the officer requested, what warnings were given, whether there was consent, a warrant, or an asserted exception, who collected the specimen, how it was handled, and what the test can establish about the relevant time.
Breath-test evidence
Chapter 724 provides that an officer-requested breath specimen must be taken and analyzed under Department of Public Safety rules by a person holding the required certificate. A defense review may examine the operator’s qualification, observation and testing sequence, instrument status and maintenance, reference and diagnostic checks, environmental or radio-frequency issues reflected in the records, reported agreement between samples, and the timing between driving and testing.
The existence of a printed result does not answer every evidentiary question. The State must connect the analysis to a properly administered test and to its theory of intoxication at the time the vehicle was operated.
Blood-test evidence
Texas law limits who may take an officer-requested blood specimen and requires a sanitary place. Depending on the case, the record may include a warrant or consent documentation, medical-facility records, collection kit information, seals, labels, transfer logs, storage records, laboratory worksheets, chromatograms, calibrations, quality-control material, and analyst testimony.
- Authority: Was the specimen obtained through valid consent, a warrant, or a legally supportable exigency?
- Collection: Was the collector authorized, and what do the records show about the site, kit, labeling, and procedure?
- Chain of custody: Can the State account for possession, transfer, storage, and laboratory receipt?
- Laboratory method: Do the underlying data, controls, calibrations, and review records support the reported result?
- Interpretation: What does the result establish—and not establish—about the time of driving?
Refusal, warrants, and required specimens
A refusal can carry separate administrative consequences and may be offered as evidence in a later prosecution. It does not necessarily prevent an officer from applying for a search warrant. Chapter 724 also identifies circumstances in which an officer must require a specimen after a refusal, but it states that a required specimen must be supported by a warrant or probable cause to believe exigent circumstances exist.
Because the facts can involve consent, refusal, warrant language, medical care, collision evidence, or statutory procedures, the actual paperwork and recordings should be reviewed rather than reduced to “passed,” “failed,” or “refused.”
Access to analysis information and an additional specimen
Texas Transportation Code Sections 724.018 and 724.019 provide additional, time-sensitive protections. On request, full information concerning the State-requested specimen analysis must be made available to the person who provided the specimen or that person’s attorney. A person who submits to an officer-requested or officer-ordered specimen may also request, within a reasonable time not exceeding two hours after arrest, that a qualified professional selected by the person take an additional blood specimen for analysis.
Law enforcement is not required to provide transportation for the additional test, and failure or inability to obtain the additional specimen does not automatically prevent admission of the State’s analysis. The arrest timeline and any request, response, or denied access should nevertheless be documented and reviewed promptly.
Testing and the 0.15 allegation
Texas Penal Code Section 49.04 provides a Class A misdemeanor classification when an analysis of blood, breath, or urine shows an alcohol concentration of 0.15 or more at the time the analysis was performed. The statutory language, test timing, admissibility, and underlying records matter. The reported figure should not be discussed as though it automatically resolves every element or enhancement issue.
The ALR proceeding has its own deadline
Texas DPS treats a refusal or an alcohol concentration at or above the applicable threshold as a potential basis for a separate civil license suspension. The notice path can affect the hearing-request deadline. Review the official Texas DPS ALR guidance and the firm’s ALR hearing page, and have the actual notice reviewed promptly.
Records to request and preserve
- All body-camera, dash-camera, jail, and testing-room video.
- The statutory warning, consent or refusal documents, and suspension notice.
- The warrant application, affidavit, warrant, return, and collection records if blood was compelled.
- Breath-instrument records or blood-laboratory data—not only the final certificate or summary.
- The exact driving, stop, arrest, collection, and analysis timeline.
- Medical, medication, and physical-condition information that may be relevant to observations or testing.
Frequently asked questions
Can police obtain blood after a DWI refusal?
An officer may seek a search warrant. Texas law also identifies circumstances requiring a specimen after refusal, subject to a warrant or probable cause for exigent circumstances. The actual legal authority and records must be reviewed.
Does a 0.08 or higher result automatically prove DWI?
No single item eliminates the need to prove the statutory elements with admissible evidence. Collection, analysis, timing, interpretation, and the rest of the evidence remain relevant.
What records matter in a breath-test case?
Operator credentials, observation and testing records, instrument status, maintenance and diagnostic material, sample data, video, and the timeline can all matter.
Is the license case separate from the criminal DWI?
Yes. The ALR proceeding is a separate civil administrative process with its own notice and hearing deadline, although evidence may overlap with the criminal investigation.
Legal information reviewed: November 4, 2026. Statutes and procedures can change, and the law applicable to a case may depend on the alleged offense date, criminal history, and individual facts.