Beyond Alcohol: Drug-Related DUI (DUID) Defense in Austin, Texas

A DWI doesn’t always involve alcohol. Prescription medications, over-the-counter drugs, marijuana, and even some legal substances can lead to a DUI charge. In Texas, you can be charged with driving while intoxicated if any drug—legal or illegal—impairs your ability to drive. A single prescription pill, a dose of cold medicine, or a trace amount of marijuana can land you in court facing the same penalties as an alcohol-related DWI. The difference is that drug cases often rely on questionable evidence: the officer’s opinion, field sobriety tests that are not designed for drug impairment, and blood tests that can be challenged.

At Barton & Associates, Attorneys at Law, we defend clients across Central Texas against drug-related DUI charges. Whether you were pulled over in downtown Austin, on the highways near Cedar Park, or in the Hill Country communities west of the city, we understand how drug DUI cases are different from alcohol cases. Our attorneys have spent decades in Travis County courtrooms and beyond, handling complex DUI cases with skill and determination.

We know that drug DUIs often hinge on subjective observations—the officer’s claim that your eyes were red or your speech was slurred. We know how to challenge the field sobriety tests, which were designed for alcohol, not drugs. We know how to attack the blood test results, questioning the chain of custody, the storage, and the science behind the testing. And we know how to defend your rights when the evidence against you is circumstantial.

If you are facing a drug-related DUI, you need an attorney who understands the unique challenges of these cases. Let us help you fight back.

Understanding Drug-Related DUI (DUID) in Texas

Under Texas law, a person commits DWI if they operate a motor vehicle while intoxicated. Intoxication can be proven in two ways: a BAC of 0.08 or higher, or the loss of normal use of mental or physical faculties. Drug-related DUI falls under the second category.

The Two Paths to Conviction:

• Per Se: BAC of 0.08 or higher (alcohol only)

• Impairment: Loss of normal use of mental or physical faculties due to alcohol, drugs, or a combination

What Drugs Can Lead to a DUID:

• Illegal Drugs: Marijuana, cocaine, methamphetamine, heroin, ecstasy

• Prescription Medications: Xanax, Valium, Ambien, Oxycodone, Adderall, opioids

• Over-the-Counter Medications: Cold medicine, allergy medication, sleep aids

• Legal Substances: Any substance that impairs your ability to drive

The Penalty:

Drug-related DUI carries the same penalties as alcohol-related DWI:

• First Offense: Class B misdemeanor, up to 180 days in jail, fine up to $2,000, license suspension

• Second Offense: Class A misdemeanor, up to 1 year in jail, fine up to $4,000, license suspension

• Third Offense: Third-degree felony, 2 to 10 years in prison

For residents across Central Texas, a DUID charge can change your life.

What Is the Penalty for Drug-Related DUI in Texas?

Drug-related DUI carries the same penalties as alcohol-related DWI, based on the number of prior offenses.

First DUID:

• Class B misdemeanor

• Up to 180 days in jail

• Fine of up to $2,000

• License suspension up to 1 year

Second DUID:

• Class A misdemeanor

• Up to 1 year in jail

• Fine of up to $4,000

• License suspension up to 2 years

Third DUID:

• Third-degree felony

• 2 to 10 years in prison

• Fine of up to $10,000

• License suspension up to 2 years

Collateral Consequences:

• Criminal Record: A permanent conviction on your record

• Loss of Firearm Rights: A felony conviction results in lifetime prohibition

• Professional Licensing: Licensing boards may deny or revoke licenses

• Employment: Many employers will not hire individuals with DUI convictions

• Immigration: Non-citizens may face deportation

For those in the Austin area, a DUID conviction carries the same weight as an alcohol DWI.

How to Defend a Drug-Related DUI Charge

Defending against a DUID requires a different approach than defending against an alcohol DWI. The evidence is often more subjective and more easily challenged.

Defense 1: The Traffic Stop Was Illegal

The officer must have reasonable suspicion to stop your vehicle. If the stop was based on a hunch, the driver’s appearance alone, or an improper reason, the evidence can be suppressed.

Defense 2: No Probable Cause for Arrest

After the stop, the officer must have probable cause to arrest you. The officer’s observations—red eyes, slurred speech, unsteadiness—are subjective and can be challenged.

Defense 3: Field Sobriety Tests Were Not Designed for Drugs

Field sobriety tests (FSTs) were developed for alcohol impairment, not drug impairment. Your attorney can challenge:

• Whether the tests were administered properly

• Whether the officer was properly trained

• Whether medical conditions, fatigue, or other factors affected performance

• Whether the tests are even reliable for detecting drug impairment

Defense 4: The Blood Test Was Flawed

Blood tests are common in drug DUI cases. Your attorney can challenge:

• Chain of custody (was the blood properly handled?)

• Storage (was the blood properly stored and refrigerated?)

• Contamination (could the sample have been contaminated?)

• Timing (was the draw too long after driving to be relevant?)

• The presence of legal substances (prescription medications)

Defense 5: The Substance Was Legal and Used as Prescribed

If you have a valid prescription for a medication that caused the alleged impairment, you may have a defense. Your attorney can present evidence that you were taking the medication as prescribed and that it was not impairing your ability to drive.

Defense 6: Medical Conditions

Medical conditions such as diabetes, neurological disorders, or eye conditions can cause symptoms that mimic drug impairment. Your attorney can present medical evidence to support this defense.

For those in Central Texas, a strong defense can mean the difference between a conviction and a dismissal.

Field Sobriety Tests and Drug Impairment

Field sobriety tests (FSTs) were developed by the National Highway Traffic Safety Administration (NHTSA) specifically for alcohol impairment. They have not been validated for drug impairment.

The Three Standardized Tests:

• Horizontal Gaze Nystagmus (HGN): Eye movement test. This test measures involuntary jerking of the eyes, which can be caused by alcohol, certain drugs, and medical conditions.

• Walk and Turn: Nine-step walk, turn, and return. This test measures balance and coordination, which can be affected by fatigue, nervousness, and medical conditions.

• One-Leg Stand: Standing on one leg for 30 seconds. This test also measures balance and coordination.

Why FSTs Are Problematic for Drug Cases:

• They were not designed to detect drug impairment

• They have not been validated for drug impairment

• Many drugs do not produce the same physical symptoms as alcohol

• Medical conditions, fatigue, and nervousness can cause poor performance

Challenging FSTs in Drug Cases:

Your attorney can argue that the FSTs are not reliable indicators of drug impairment and that the officer’s observations should be given little weight.

For drivers across the Austin metro area, challenging field sobriety tests is often the key to a DUID defense.

Blood Tests in Drug DUI Cases

Blood tests are the primary evidence in drug DUI cases. They can be challenged on multiple fronts.

How Blood Tests Work:

• A blood sample is drawn, usually at a hospital or police station

• The sample is sent to a lab for testing

• The lab tests for the presence of drugs or alcohol

Challenging Blood Tests:

• Chain of Custody: Was the blood properly handled from draw to analysis? Any gap in the chain can compromise the evidence.

• Proper Draw: Was the blood drawn by a qualified person using proper procedures?

• Storage: Was the blood properly stored and refrigerated? Improper storage can degrade the sample.

• Contamination: Could the sample have been contaminated?

• Timing: Was the draw too long after driving to be relevant?

• Lab Errors: Did the lab follow proper protocols? Are the technicians qualified?

Independent Testing:

Your attorney can request independent testing of the blood sample. If the independent test shows different results, the State’s case may be compromised.

For residents across Central Texas, challenging the blood test is often the most effective defense.

Prescription Medications and DUI

In Texas, you can be charged with DUI for driving while impaired by prescription medication—even if you have a valid prescription.

What the State Must Prove:

• You were operating a motor vehicle

• You were impaired (loss of normal use of mental or physical faculties)

• The impairment was caused by the medication

Defending Prescription DUI Cases:

• No Impairment: The medication did not impair your ability to drive

• Proper Use: You were taking the medication as prescribed

• Unlawful Stop: The traffic stop was illegal

• Field Sobriety Tests: Challenging the reliability of FSTs for drug impairment

• Blood Test Issues: Challenging the chain of custody, storage, or lab errors

The Danger of Prescription DUI:

Many people assume that if a medication is prescribed, it is safe to drive. This is not the case. Any medication that carries a warning about driving or operating machinery can lead to a DUI if it impairs your ability to drive.

For those in the Austin area, a prescription DUI is treated as seriously as an alcohol DWI.

Marijuana DUI: The New Frontier

With the legalization of hemp and the proliferation of CBD products, marijuana DUI cases have become more complex.

What the State Must Prove:

• You were operating a motor vehicle

• You were impaired (loss of normal use of mental or physical faculties)

• The impairment was caused by marijuana

The Challenge of Marijuana DUI:

• Marijuana can stay in the system for days or weeks after use

• The presence of THC does not necessarily mean impairment

• Field sobriety tests were not designed for marijuana impairment

Defending Marijuana DUI:

• No Impairment: The THC in your system did not impair your driving

• Legal Hemp: The substance may have been legal hemp, not illegal marijuana

• CBD Products: CBD products can cause positive tests without impairment

• Medical Marijuana: Texas has a limited medical marijuana program; patients may have a defense

For drivers across Central Texas, marijuana DUI cases require a nuanced defense.

Frequently Asked Questions About Drug-Related DUI in Austin, Texas

When clients come to our office—whether from the urban core of Austin, the suburbs to the north and south, or the Hill Country communities—they often have questions about drug-related DUI. Here are the answers to the most common inquiries we receive.

What is the difference between DWI and DUID?

DWI (Driving While Intoxicated) typically refers to alcohol. DUID (Driving Under the Influence of Drugs) refers to impairment by drugs. In Texas, both are prosecuted under the same statute.

Can I get a DUI for prescription medication?

Yes. If a prescription medication impairs your ability to drive, you can be charged with DUI—even if you have a valid prescription.

Can I get a DUI for marijuana if it was prescribed?

Texas has a limited medical marijuana program (Compassionate Use Program). If you are a registered patient, you may have a defense, but the law is complex.

What are the penalties for a drug-related DUI?

The penalties are the same as for alcohol DWI: first offense is a Class B misdemeanor, second is a Class A misdemeanor, third is a third-degree felony.

Can field sobriety tests detect drug impairment?

Field sobriety tests were designed for alcohol, not drugs. They are not reliable indicators of drug impairment and can be challenged.

How can I challenge a blood test in a drug DUI case?

Your attorney can challenge the chain of custody, storage, contamination, timing, and lab errors. Independent testing may also be available.

Do I need an attorney for a drug-related DUI?

Yes. Drug DUI cases often rely on questionable evidence. An experienced attorney can challenge the stop, the field tests, and the blood evidence.

Why Barton & Associates for Drug-Related DUI Defense in Austin

Drug-related DUI cases are different. The evidence is often subjective. The science is often questionable. The stakes are just as high. Our attorneys have spent decades in courtrooms across Central Texas, handling the most complex DUI cases with skill and determination.

We know how to challenge field sobriety tests that were never meant for drugs. We know how to attack blood test results. We know how to defend your rights when the evidence against you is circumstantial.

Take the First Step Toward Protecting Your Future

If you are facing a drug-related DUI charge, your freedom is on the line. Do not wait. The sooner you have an experienced attorney on your side, the better your chances of a favorable outcome.

Call our Austin office today at 512-THE-FIRM (843-3476) to speak with an experienced DUI defense attorney about your case. You can also complete the online Free Consultation form on our website to schedule a confidential meeting. Please note, on-site consultations are by appointment only. We look forward to helping you protect your rights and your future.

Main Category: Criminal Defense Austin
Practice Area Category: DWI & Intoxication
Barton & Associates, Attorneys at Law
316 W 12th St Suite 400, Austin, TX 78701
Office: 512-THE-FIRM (843-3476)