DWI and Prescription Drugs

You Can Be Arrested for DWI Even If You Took Your Medication Exactly as Prescribed

Many people are surprised to learn they can be arrested for driving while intoxicated even when they are taking medication prescribed by their doctor. Unlike alcohol-related DWI cases, prescription drug cases often involve medications that were obtained legally and used for legitimate medical purposes.

That does not automatically make driving illegal, nor does it automatically make someone guilty of driving while intoxicated.

Texas law focuses on whether a person’s mental or physical faculties were impaired while operating a motor vehicle. Prosecutors do not have to prove you were taking an illegal drug. Instead, they attempt to prove that a prescription medication affected your ability to drive safely.

At Mark Diaz & Associates, we have represented individuals facing DWI charges throughout Galveston County, Harris County, and surrounding Texas communities for nearly 30 years. Prescription drug cases often involve very different evidence than alcohol-related arrests, which is why every investigation deserves a careful review.

Prescription Medication Alone Does Not Prove Intoxication

Many medications carry warnings about drowsiness or impaired driving. That does not mean everyone who takes those medications is automatically intoxicated.

People respond differently to prescription drugs. Factors such as dosage, medical history, body chemistry, and whether the medication was recently prescribed can all affect how someone reacts.

The prosecution still has the burden of proving that your ability to safely operate a vehicle was impaired at the time of your arrest.

Simply showing that you possessed a lawful prescription or had medication in your system does not automatically satisfy that burden.

Common Prescription Medications Involved in DWI Cases

Prescription drug DWI arrests involve a wide variety of medications.

Some of the medications frequently involved include:

• Pain medications and opioids
• Anti-anxiety medications
• Sleep medications
• Muscle relaxers
• Certain antidepressants
• ADHD medications
• Anti-seizure medications

Some cases involve a single medication. Others involve multiple prescriptions or a combination of prescription medication and alcohol.

Every situation is different, which is why the evidence should be evaluated carefully rather than relying on assumptions about the medication involved. An experienced criminal defense attorney can review the facts of your case, explain your legal options, and begin building a defense tailored to your circumstances. 

These Cases Often Look Different Than Alcohol-Related DWI Arrests

Unlike traditional drunk driving cases, prescription drug investigations often do not involve a high breath alcohol concentration.

Instead, prosecutors may rely on observations made by law enforcement officers, field sobriety testing, statements made during the investigation, medical records, toxicology reports, and testimony from specialists regarding the effects of certain medications.

At Mark Diaz & Associates, our criminal defense lawyers examine the entire investigation rather than focusing on a single piece of evidence.

Important questions often include:

• Why was the traffic stop initiated?
• Did officers have probable cause for the arrest?
• What observations did officers actually make?
• Were field sobriety tests administered properly?
• Was blood testing conducted according to established procedures?
• Can prosecutors establish that the medication actually caused impairment?

Those questions frequently become central issues in prescription drug DWI cases.

Mixing Alcohol and Prescription Medication Can Complicate a Case

Some prescription drug DWI cases involve allegations that alcohol and medication were consumed together.

Certain medications may increase the effects of alcohol, while others may interact in ways that affect coordination, judgment, or reaction time. Prosecutors often argue that these combined effects contributed to impaired driving.

Even so, the prosecution must still prove its case with reliable evidence.

Every investigation should be reviewed carefully to determine whether the available evidence actually supports the allegations being made rather than relying on assumptions about how particular medications may affect different individuals.

Building a Strong Defense Requires Looking Beyond the Toxicology Report

Many people assume that a laboratory report determines the outcome of a prescription drug DWI case.

It does not.

A toxicology report simply identifies what substances may have been present. It does not automatically establish when medication was taken, how it affected a particular individual, or whether it actually impaired that person’s ability to safely operate a vehicle.

Depending on the circumstances, our firm may evaluate:

• Whether the traffic stop was lawful
• Whether officers followed proper investigative procedures
• Whether blood testing was conducted correctly
• Whether laboratory results were reliable
• Whether medications were taken as prescribed
• Whether prosecutors can actually prove impairment

Every prescription drug DWI case presents different facts, and every defense strategy should be developed accordingly.

A Conviction Can Affect More Than Your Driving Record

Many people charged with prescription drug DWI have never been arrested before. They have careers, professional licenses, families, and responsibilities that could all be affected by a criminal conviction.

Depending on your circumstances, a conviction may affect:

• Employment opportunities
• Professional licensing
• Commercial driving privileges
• Insurance rates
• Educational opportunities
• Future criminal background checks

Because the consequences often extend beyond the courtroom, it is important to understand your legal options before making decisions about your case.

Speak With a Texas Prescription Drug DWI Attorney Today

If you have been arrested for driving while allegedly impaired by prescription medication, do not assume the prosecution’s case is as straightforward as it may appear. These investigations often involve complex medical, scientific, and legal issues that deserve careful review.

For nearly 30 years, Mark Diaz & Associates has represented individuals facing first-time DWI offenses, felony DWI, and other criminal charges throughout Galveston County, Harris County, and surrounding Texas communities. We offer free consultations, complimentary parking at our Galveston office, and bilingual assistance for Spanish-speaking clients. Se habla español.

Call 409-515-6170 today to schedule a free consultation and discuss your case with Mark Diaz & Associates.