Lewisville Intoxication Assault Attorneys

The Deadly Weapon Finding — Not Automatic

A common misunderstanding is that every Intoxication Assault case automatically produces a deadly weapon finding on the vehicle. Texas case law is clearer and more defense-friendly than that. The deadly weapon finding is contestable, requires specific evidence, and is subject to a developed body of appellate law that rejects deadly weapon findings in cases that fall short of the statutory test.

The Statutory Framework — Texas Penal Code §1.07(a)(17)

Penal Code §1.07(a)(17) defines a deadly weapon as (A) a firearm or anything manifestly designed, made, or adapted for the purpose of inflicting death or serious bodily injury, or (B) anything that in the manner of its use or intended use is capable of causing death or serious bodily injury. A vehicle is not a deadly weapon per se. It becomes a deadly weapon only if used in a manner capable of causing death or serious bodily injury.

The Sierra Two-Part Analysis

Under Sierra v. State, 280 S.W.3d 250 (Tex. Crim. App. 2009), the court reviewing a deadly weapon finding in a DWI-family case considers two questions:

• The manner in which the defendant used the motor vehicle during the felony; and
• Whether, during the felony, the motor vehicle was capable of causing death or serious bodily injury.

The Foley Five Factors

Under Foley v. State, 327 S.W.3d 907 (Tex. App.—Corpus Christi 2010, pet. ref’d), the manner-of-use analysis considers five factors:

• Intoxication;
• Speeding;
• Disregarding traffic signs and signals;
• Driving erratically; and
• Failure to control the vehicle.

Cases Rejecting Deadly Weapon Findings

Several important appellate decisions have rejected deadly weapon findings in DWI-family cases, establishing that the finding is not automatic:

• Couthren v. State, 571 S.W.3d 786 (Tex. Crim. App. 2019) — a deadly weapon finding in a DWI case is dependent upon specific testimony in the record about the manner of use. There must be evidence that the manner of driving is capable of causing death or serious bodily injury apart from the fact of collision and the defendant’s intoxication. Intoxication plus collision, without more, does not support the finding.
• Pointe v. State, 371 S.W.3d 527 (Tex. App.—Beaumont 2012) — no deadly weapon finding where the other driver pulled out in front of the defendant and caused the accident, even though the defendant was intoxicated. Intoxication alone is not enough — reckless or dangerous manner of use is required.
• Williams v. State, 946 S.W.2d 432 (Tex. App.—Fort Worth 1997) — a deadly weapon finding requires evidence that, when the DWI occurred, someone was actually present and actually placed in danger of serious bodily injury or death. Hypothetical danger is insufficient.

Consequences of a Deadly Weapon Finding

• 50 percent parole eligibility. Parole eligibility is calculated at one-half of the calendar time served, rather than the standard one-fourth. A 10-year sentence means 5 years of actual time before eligibility, not 2.5 years.
• No good conduct credit toward parole eligibility. Good conduct time continues to accrue for other purposes, but does not accelerate parole eligibility on a deadly weapon finding.
• No mandatory supervision. The automatic release-to-supervision framework for non-violent offenses does not apply.
• No community supervision from the court. Under CCP Art. 42A.054, where an affirmative deadly weapon finding is entered, the judge cannot grant community supervision. Only a jury can grant probation in such cases.

Whether a deadly weapon finding attaches is itself negotiable in some cases. Where the State’s evidence falls short of the Sierra/Foley framework, the finding can be defeated at trial or avoided by plea. The difference changes the actual-time-served calculation by years.

The Full DWI Forensic Framework Still Applies

Because §49.07 requires the State to prove intoxication, the entire DWI forensic framework applies to the defense. Every challenge available in a standard DWI case is available in an Intoxication Assault case and the stakes are dramatically higher.

Blood Test Challenges — GC-FID at DPS Garland

Blood alcohol analysis in Texas is performed by headspace gas chromatography with flame ionization detection (GC-FID). Cases from Denton County are often analyzed at the DPS Crime Lab in Garland. Every step of the analysis is contestable:

• Chain of custody — from blood draw through laboratory receipt through storage through analysis.
• Preservative balance — sodium fluoride (to prevent fermentation) and potassium oxalate or EDTA (to prevent clotting) in correct amounts.
• Instrument calibration — quality control standards, reference standards, and run-to-run calibration.
• Operator certification and protocol adherence.
• Uncertainty of measurement — GC-FID analysis has known analytical uncertainty that can be material at any BAC tier.

Retrograde Extrapolation

A blood test taken hours after an accident does not measure BAC at the time of driving. Retrograde extrapolation (the calculation that estimates BAC at an earlier time from a later measurement) involves assumptions about absorption phase, elimination rate, and time-to-peak that are often not met in Intoxication Assault cases. A driver still in the absorption phase at the time of driving may have had a lower BAC then than at the time of testing. Texas is a “time of driving” state. Intoxication at the time of testing is not the question.

Breath Test Challenges

Where breath testing was performed, the 15-minute observation period, operator certification, instrument calibration, and interfering-substance analysis all apply. Residual mouth alcohol from recent drinking, GERD, dental work, and diabetic ketoacidosis can all affect breath readings.

SFST Administration

Accident-scene field sobriety testing is distorted by the physiological effects of the accident itself such as adrenaline response, injuries, medical shock, and environmental factors (roadway slope, lighting, weather, passing traffic). As a trained SFST instructor, Deandra Grant addresses SFST reliability in every case.

Hospital Blood — ETOH in Medical Records

A distinctive feature of Intoxication Assault cases: even where no police-collected blood sample exists (or in addition to one) the State may subpoena the defendant’s medical records from the treating hospital and use ETOH (ethanol) readings from clinical blood draws at trial. Clinical blood tests are performed for medical purposes, not forensic purposes, and they differ from DPS-lab forensic blood tests in important ways.

• Serum versus whole blood. Clinical laboratories typically test serum (the liquid portion after separation from red blood cells), whereas forensic laboratories test whole blood. Serum ethanol readings are typically higher than whole-blood readings (commonly 12-20 percent higher) because ethanol distributes preferentially in the aqueous phase.
• Clinical methodology. Hospital laboratories use enzymatic assay methods (ADH-based) rather than the GC-FID methodology used in forensic laboratories. Enzymatic assays are subject to different interferences and uncertainty profiles.
• Chain of custody. Medical blood draws are collected and handled for medical purposes, not forensic evidentiary purposes. Chain of custody, labeling, and storage practices differ from forensic standards.
• Timing and interpretation. Hospital blood is often drawn hours after the accident, raising the same retrograde-extrapolation issues that apply to forensic blood plus additional interpretive issues tied to IV fluids, surgery, blood transfusions, and trauma-related physiological changes.

Where the State relies on hospital blood, the methodology, timing, and interpretation are all contestable. These are distinct challenges from those that apply to DPS-lab forensic blood, and they require specific forensic analysis.

Article 38.23 — No Good Faith Exception

Every Intoxication Assault case begins with the lawfulness of the stop, search, seizure, and blood draw. CCP Article 38.23 is Texas’s exclusionary rule, and it is more protective than its federal counterpart: Texas carries no good faith exception. Evidence obtained in violation of the law is suppressible regardless of what it shows.

Suppression issues frequently central to Intoxication Assault cases:

• Reasonable suspicion and probable cause for the stop (where the driver was not immediately at the accident scene).
• Probable cause for arrest — articulable facts linking the driver to intoxication versus accident-shock symptoms.
• Blood warrant validity — affidavit specificity, probable cause, timing, and scope.
• Implied consent under Transportation Code Chapter 724 and the statutory vs. warrant-based blood draw distinction.
• Custodial statements — CCP Article 38.22 compliance on Miranda warnings, voluntariness of any waiver, and electronic recording of statements.

Probation — CCP Art. 42A.401 Mandatory Jail

Where community supervision (probation) is granted on an Intoxication Assault case (by a jury, or where no deadly weapon finding has been entered) CCP Article 42A.401 imposes a statutory minimum jail term as a condition of probation: 30 days in county jail for Intoxication Assault. This is a mandatory floor, not a discretionary condition. Courts have no authority to waive it.

This changes the plea-stage calculus in important ways. A defendant choosing between probation and a prison sentence must understand that probation is not a jail-free outcome on an Intoxication Assault. A minimum 30-day jail term is part of any probation disposition, on top of ordinary probation conditions, fines, community service, substance abuse treatment, and ignition interlock.

Civil Liability and 11 U.S.C. §523(a)(9) Non-Dischargeability

The consequences of Intoxication Assault extend beyond the criminal case. Parallel civil exposure typically includes:

• Compensatory damages under Texas Civil Practice and Remedies Code Chapter 41 — medical expenses, property damage, lost wages, pain and suffering.
• Exemplary (punitive) damages under CPRC §41.003 for gross negligence. Intoxicated driving that causes serious injury is often treated as gross negligence per se for exemplary-damages purposes.
• Auto insurance policy exclusions for DWI-related accidents, which can leave the defendant personally liable for uninsured damages.
• Civil judgment non-dischargeability in bankruptcy — 11 U.S.C. §523(a)(9) provides that a judgment for death or personal injury caused by the operation of a motor vehicle while intoxicated cannot be discharged in bankruptcy. The civil judgment follows the defendant indefinitely.

Civil and criminal exposure are analyzed together. Statements made in the criminal case can become evidence in the civil case; depositions in the civil case can create impeachment in the criminal case; and the strategic choices on one side affect the other.

ALR and License Consequences

The Administrative License Revocation process applies alongside the criminal case:

• Failed test: 90-day ALR suspension on a first failed test.
• Refusal: 180-day ALR suspension on a first refusal (2 years on a repeat).
• ALR deadline: 15 days from the date of notice of suspension.
• Criminal-court license suspension on §49.07 conviction: 180 days to 2 years, with potentially longer exposure tied to the felony conviction itself.
• Transportation Code §709.001 civil statutory fine: $3,000 first offense; $6,000 if BAC is 0.15+. This is on top of the criminal fine.

Defense Strategies in Lewisville Intoxication Assault Cases

SBI definition challenges. Whether the injury meets the §1.07(46) threshold is a medical and legal question. Severity alone does not make an injury SBI. The statutory categories must be met. Medical records, treating physician testimony, and prognosis evidence all bear on whether the SBI element is met.

• 6.04 but-for causation challenges. The State must prove more than intoxication plus an accident. Where a concurrent cause (mechanical failure, third-party conduct, road hazard, complainant fault) was clearly sufficient and the defendant’s conduct clearly insufficient, the §6.04 exception defeats causation. Independent accident reconstruction and black-box data analysis are central to this defense.

Deadly weapon finding challenges. The deadly weapon finding is not automatic. Where the State cannot produce specific evidence of reckless or dangerous manner of use apart from the collision and the intoxication, the finding can be defeated. Years of exposure turn on this issue.

Enhancement challenges. §49.09(b-1) and (b-4) enhancements require specific factual predicates (victim status in actual discharge of official duty, or TBI specifically resulting in persistent vegetative state). The difference between third-degree and first-degree exposure turns on these facts, which are contestable.

Forensic challenges on intoxication. Blood test methodology, retrograde extrapolation, breath test reliability, and SFST administration all apply. As an ACS-CHAL Forensic Lawyer-Scientist, with a Master of Science in Pharmaceutical Science and a Graduate Certificate in Forensic Toxicology, Deandra Grant reads the underlying laboratory data, not just the summary report. Hospital blood (clinical ETOH readings from medical records) is separately contestable from DPS-lab forensic blood.

Article 38.23 — no good faith exception. Stops, searches, blood warrants, and custodial statements are all subject to suppression analysis. Evidence from an unlawful investigation is suppressible regardless of what it shows. Texas’ more protective exclusionary rule is central to the defense of every §49.07 case.

Coordination with civil defense. Civil and criminal exposure run on parallel tracks. Coordinated strategy (addressing the §523(a)(9) non-dischargeability, insurance issues, and parallel civil discovery) protects the client’s long-term position across both cases.

Digital evidence review. Modern accident investigations rely on vehicle event data recorders (“black boxes”), cell phone records, traffic camera footage, and commercial surveillance systems. Independent analysis (not reliance on the police department’s interpretation) is essential. Partner Douglas Huff’s digital forensics training applies directly to this evidence stream.

Punishment mitigation from day one. Where conviction appears likely, punishment mitigation begins at the first client meeting and not just at the sentencing hearing. Baseline substance-abuse evaluation, voluntary SCRAM monitoring to document sobriety, character witness development, and documented remorse (contemporaneous rather than post-conviction) all contribute to the mitigation record.

Why Deandra Grant Law for Lewisville Intoxication Assault Defense

• • Office in Denton. 30+ years in Denton County courts. 500+ trials to verdict. The Denton County Courthouse and the Denton County DA’s office are familiar ground.
  • ACS-CHAL Forensic Lawyer-Scientist — Deandra Grant. Blood alcohol analysis, GC-FID methodology, and retrograde extrapolation evaluated at the chromatography level.
  • Master of Science in Pharmaceutical Science + Graduate Certificate in Forensic Toxicology. Pharmacology of impairment, hospital-blood vs forensic-blood methodology, and interpretation of laboratory data.
  • Trained SFST Instructor — Deandra Grant. Field sobriety test administration, scoring, and interpretation challenged in every case.
  • ACS-CHAL Forensic Lawyer-Scientist — Douglas Huff. Second forensic-credentialed attorney at the firm. Digital forensics training applicable to accident reconstruction and black-box evidence.
  • Deadly weapon finding defense. 
  • Article 38.23 — no good faith exception. Every §49.07 case begins with the lawfulness of the stop, search, blood warrant, or seizure.
  • Civil-criminal coordination. Parallel civil and criminal exposure managed as an integrated defense, including §523(a)(9) non-dischargeability analysis.
  • Federal defense capability. James Lee Bright handles federal cases in the Eastern District of Texas (Sherman Division) — the federal district for Denton County.
  • 17 published law books. Including The Texas DWI Manual
  • Texas Super Lawyer since 2011. 

• AV® Preeminent rated by Martindale-Hubbell®.

If you are facing Intoxication Assault charges in Denton County, call (214) 225-7117 for a free, confidential consultation. Or schedule online at texasdwisite.com.