Understanding DWI Laws in Texas: Drugs vs. Alcohol

Driving while intoxicated is one of the most common legal challenges individuals face in Texas. The state’s laws regarding DWI are strict, aiming to protect the public from the dangers posed by impaired drivers. However, understanding these laws can be complicated, especially when it comes to the differences between DWI cases involving alcohol and those involving drugs. Both types of offenses can have serious consequences, but the way they are defined and handled under Texas law differs significantly. Knowing the rules, potential penalties, and defenses available is essential for any driver in Texas, as even a single lapse in judgment can lead to lasting consequences. At, Deandra Grant Law – Criminal & DWI Defense , we are here to guide you through the legal process and help you navigate the complexities of your case.

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What Is Considered Driving While Intoxicated in Texas?

Under Texas law, driving while intoxicated means operating a motor vehicle in a public place while impaired by alcohol, drugs, or a combination of both. Impairment is defined as a loss of normal mental or physical faculties due to the influence of a substance. This broad definition means that DWI charges can apply to cases involving alcohol, illegal drugs, prescription medications, and even over-the-counter drugs if they impair a driver’s ability to safely operate a vehicle. For alcohol-related DWIs, Texas law provides a specific standard: a blood alcohol concentration of 0.08% or higher is considered intoxicated. This measurable limit makes it easier for law enforcement to determine if a driver is over the legal limit. In contrast, there is no specific threshold for drug-related DWIs. Instead, officers must determine if the driver’s use of drugs has impaired their abilities to a degree that driving becomes unsafe.

Alcohol-Related DWI Offenses

Alcohol-related DWIs are among the most commonly charged offenses in Texas. When a driver is suspected of being under the influence of alcohol, law enforcement officers may conduct field sobriety tests or use a breathalyzer to measure the driver’s blood alcohol concentration. These tools provide evidence of whether the driver is above the legal limit of 0.08%.

Deandra M. Grant

Managing Partner

Douglas E. Huff

Partner & Criminal Division Chief

Kevin Sheneberger

Criminal Trial Division

Omar Sherif

Criminal Trial Division

Jada Fairley

Associate Attorney

James Lee Bright

Of Counsel

Penalties for alcohol-related DWI offenses in Texas can vary based on the circumstances. A first offense may result in fines, a temporary license suspension, mandatory attendance at alcohol education programs, and community service. Repeat offenses lead to harsher consequences, including longer jail sentences, higher fines, and the installation of an ignition interlock device on the offender’s vehicle. For drivers under the age of 21, Texas has a zero-tolerance policy. Any detectable amount of alcohol in their system while driving can result in criminal charges, even if their blood alcohol concentration is below 0.08%. This policy underscores the state’s commitment to preventing impaired driving and protecting the safety of its roads.

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Drug-Related DWI Offenses

Drug-related DWIs are treated just as seriously as alcohol-related ones in Texas. However, proving intoxication from drugs can be more challenging for law enforcement. Unlike alcohol, which has a clear legal threshold for intoxication, drug-related cases rely on evidence that the substance impaired the driver’s ability to operate a vehicle safely. This category of DWI includes illegal drugs such as marijuana or cocaine, but it also applies to legal substances, including prescription medications and over-the-counter drugs. Even if a drug is legally obtained or prescribed, a person can still be charged with DWI if the substance impairs their driving. In drug-related cases, officers may use blood or urine tests to determine the presence of drugs in a driver’s system. However, the presence of a drug alone is not sufficient to prove intoxication. The state must demonstrate that the driver’s use of the drug impaired their mental or physical faculties to the point of making driving unsafe. This requirement can make drug-related DWI cases more complex and difficult to prosecute.

Key Differences Between Alcohol and Drug DWI

The main difference between alcohol-related and drug-related DWI offenses in Texas is how impairment is measured and proven. For alcohol-related cases, the law provides a clear-cut standard: a blood alcohol concentration of 0.08% or higher is considered intoxicated. This standard allows for relatively straightforward testing and evidence collection. Drug-related DWI cases lack such a numerical standard, making them more subjective. Proving impairment often requires observations of the driver’s behavior, results from field sobriety tests, and testimony. The lack of a universal threshold for drug intoxication means that the burden of proof can vary depending on the substance involved and the specific circumstances of the case. Despite these differences, the consequences of a DWI conviction are severe regardless of whether the offense involves alcohol or drugs. Both types of offenses carry the potential for fines, jail time, license suspension, and lasting damage to a person’s record and reputation.

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How Law Enforcement Handles DWI Investigations

Law enforcement officers in Texas are trained to identify and address cases of suspected DWI. During a traffic stop, an officer may observe the driver’s behavior, speech, and coordination for signs of impairment. If they suspect intoxication, they may administer field sobriety tests to assess the driver’s physical and mental faculties. For alcohol-related cases, officers often use breathalyzer devices to measure blood alcohol concentration. In drug-related cases, blood or urine tests are typically required to confirm the presence of drugs in the driver’s system. Additionally, some law enforcement agencies employ drug recognition specialists who are trained to identify signs of drug impairment. Refusing to take a breath, blood, or urine test during a DWI stop can result in immediate consequences under Texas’ implied consent law. By obtaining a driver’s license, individuals agree to submit to chemical testing when suspected of DWI. Refusal to comply can lead to automatic license suspension, even if the driver is not ultimately convicted of DWI.

Case Results

Not Guilty

.17 Alcohol Level Was Reported

Case Dismissed

Arrested for DWI

Thrown Breath Score Out

.17 Breath Test

Case Dismissed

Assault Causing Bodily Injury of a Family Member

Case Dismissed

Possession of a Controlled Substance, Penalty Group 3, under 28 grams

Trial – Not Guilty

Continuous Sexual Abuse of A Child

Case Dismissed

Driving While Intoxicated With a Blood Alcohol =0.15

Trial – Not Guilty

Violation of Civil Commitment

Dismissed-Motion to Suppress Evidence Granted

Driving While Intoxicated

Dismissed-No Billed by Grand Jury

Assault Causing Bodily Injury of a Family Member with Prior

View More Results

Case Results

Not Guilty

.17 Alcohol Level Was Reported

Case Dismissed

Arrested for DWI

Thrown Breath Score Out

.17 Breath Test

Case Dismissed

Assault Causing Bodily Injury of a Family Member

Case Dismissed

Possession of a Controlled Substance, Penalty Group 3, under 28 grams

Trial – Not Guilty

Continuous Sexual Abuse of A Child

Case Dismissed

Driving While Intoxicated With a Blood Alcohol =0.15

Trial – Not Guilty

Violation of Civil Commitment

Dismissed-Motion to Suppress Evidence Granted

Driving While Intoxicated

Dismissed-No Billed by Grand Jury

Assault Causing Bodily Injury of a Family Member with Prior

View More Results

Defending Against DWI Charges

Being charged with DWI in Texas is not the same as being convicted. There are several defenses available that can help individuals fight the charges and reduce or avoid penalties. In alcohol-related cases, common defenses include challenging the accuracy of breathalyzer or blood test results, disputing the validity of the traffic stop, or questioning the administration of field sobriety tests. In drug-related cases, the defenses may focus on the testing methods used to detect drugs, the chain of custody for evidence, or whether the state can prove that the drugs actually impaired the driver’s abilities. Additionally, prescription medication cases often involve showing that the driver took the medication as directed and was unaware of its potential effects on driving. Each DWI case is unique, and the outcome depends on the circumstances of the arrest and the strength of the evidence against the driver. Seeking guidance from experienced legal professionals is critical for navigating the complexities of DWI charges.

Why It Is Important to Understand DWI Laws

Understanding Texas’ DWI laws is essential for anyone who drives. The consequences of driving while intoxicated can be severe, impacting a person’s freedom, finances, and future opportunities. By learning the rules and making responsible choices, drivers can protect themselves and others on the road. Whether it involves abstaining from alcohol before driving, being cautious with prescription medications, or understanding the risks of drug use, making informed decisions can prevent accidents and legal troubles. Knowledge of the law is a powerful tool that helps individuals stay safe and avoid unnecessary risks. If you or someone you know is facing DWI charges in Texas, it is important to have a legal team that can provide the guidance and representation needed to protect your rights. At Deandra Grant Law – Criminal & DWI Defense, we are dedicated to helping clients navigate the complexities of DWI cases, whether they involve alcohol, drugs, or both. Our goal is to ensure that you understand your options and work toward the best possible outcome for your situation. Contact Deandra Grant Law – Criminal & DWI Defense today to discuss your case and take the first step toward resolving your legal concerns.