
Sometimes Police Can Mistake Medical Symptoms For Intoxication
A Texas DWI stop often turns on an officer’s reading of a driver’s speech, balance, eyes, coordination, and behavior. That split-second judgment can lead straight to handcuffs, a DWI charge, and a fight over what the officer thought they saw.
But slurred words, unsteady footing, confusion, glassy eyes, or poor performance on roadside tests don’t always mean alcohol or drugs were involved. Medical conditions can create symptoms that look like intoxication, especially during a stressful traffic stop on the side of the road.
Diabetes is one of the clearest examples. The CDC estimates that 40.1 million people in the United States had diagnosed or undiagnosed diabetes in 2023, and 27.6 percent of adults with diabetes were undiagnosed. A driver whose blood sugar drops during a stop may seem confused, shaky, unsteady, or unable to answer questions clearly.
At our law firm, we know a DWI case can’t be evaluated fairly until the State’s evidence is tested. A Conroe DWI lawyer can review the stop, bodycam footage, medical history, test results, and officer report to determine whether a health condition, not intoxication, explains what happened.
Texas DWI Law Focuses On Intoxication, Not Just Appearance
Under Texas Penal Code § 49.04, a person commits DWI if they’re intoxicated while operating a motor vehicle in a public place. That means prosecutors need more than a vague impression that someone “looked drunk.” They need evidence that fits the legal definition of intoxication.
Texas Penal Code § 49.01 defines intoxicated in two ways. A person may be intoxicated if they don’t have the normal use of mental or physical faculties because of alcohol, drugs, a controlled substance, a dangerous drug, a combination of substances, or another substance introduced into the body. A person may also be intoxicated with an alcohol concentration of 0.08 or more.
That definition matters in a medical-condition case. A driver may look impaired, but the defense can ask whether the symptoms came from alcohol, drugs, medication, illness, low blood sugar, a balance disorder, fatigue, or another explanation the officer didn’t investigate.
Medical Conditions That Can Look Like DWI
Several medical issues can create signs that overlap with what officers often describe in DWI reports. The condition doesn’t automatically defeat the charge, but it can become a central defense issue when records, testing, and video line up with the symptoms.
- Diabetes and Low Blood Sugar: Hypoglycemia can cause confusion, weakness, shaking, dizziness, trouble walking, and trouble talking.
- GERD and Acid Reflux: Reflux can bring stomach contents back into the throat or mouth, which may matter in a breath-test case if mouth alcohol or regurgitation becomes an issue.
- Balance and Inner Ear Disorders: Vestibular conditions can cause dizziness, imbalance, vertigo, and unsteady movement.
- Neurological Conditions: Migraines, seizure disorders, prior head injuries, stroke-like symptoms, or other neurological issues may affect speech, coordination, balance, or eye movement.
- Medication Side Effects: Prescription drugs, allergy medication, sleep aids, muscle relaxers, and sedating medicines can affect reaction time, speech, alertness, and balance.
- Fatigue, Anxiety, and Panic: Exhaustion or panic during a traffic stop can make someone shaky, confused, emotional, or slow to respond.
The key is documentation. A real medical explanation needs medical records, prescriptions, glucose logs, diagnosis history, treatment notes, or medical testimony that connects the condition to the officer’s observations.
How Low Blood Sugar Can Mimic Intoxication
Low blood sugar can become dangerous quickly. According to the CDC, blood sugar below 70 mg/dL is considered low, and symptoms can include weakness, trouble walking or seeing clearly, strange behavior, confusion, dizziness, shaking, and sweating.
The CDC also notes that low blood sugar can affect the brain right away. A person may have trouble walking or talking, and severe low blood sugar can lead to fainting, seizures, or coma.
Those symptoms can look suspicious during a DWI stop. A driver may have trouble following instructions, answering questions, standing still, or explaining what’s happening. If the officer assumes alcohol is the cause, the medical emergency may be treated like a crime.
Field Sobriety Tests Don’t Diagnose Medical Problems
Texas officers often rely on field sobriety tests during a DWI investigation. NHTSA describes the standardized field sobriety test battery as three tests: horizontal gaze nystagmus, walk-and-turn, and one-leg stand.
Those tests may be used to look for clues of impairment, but they don’t diagnose why a person’s balance, eyes, coordination, or attention was affected. That matters because medical issues can influence the same things those tests measure.
- Horizontal Gaze Nystagmus: Eye movement may become an issue in cases involving alcohol, drugs, neurological conditions, vision problems, or vestibular disorders.
- Walk-And-Turn: Balance, leg injuries, back problems, neuropathy, anxiety, footwear, road slope, lighting, and fatigue can affect performance.
- One-Leg Stand: Age, weight, injuries, balance disorders, tremors, and medical conditions can make the test difficult even for a sober driver.
If the officer didn’t ask about medical conditions, injuries, medications, diabetes, balance problems, or recent illness before scoring the tests, that gap can become important. A test result is not the same thing as proof beyond a reasonable doubt.
GERD Can Become An Issue In Breath-Test Cases
Gastroesophageal reflux disease, commonly called GERD, can matter in some breath-test cases. The National Institute of Diabetes and Digestive and Kidney Diseases explains that GERD can involve regurgitation, meaning stomach contents come back up through the esophagus into the throat or mouth. NIDDK also explains that GERD may develop when the lower esophageal sphincter becomes weak or relaxes when it shouldn’t.
That doesn’t mean every driver with reflux has a false breath test. But if a driver burped, regurgitated, vomited, had an active reflux episode, or experienced mouth contamination near the time of testing, the breath result may need closer review.
Texas breath testing rules require the operator to remain in the subject’s continuous presence for at least 15 minutes immediately before the test and exercise reasonable care to ensure the subject doesn’t place substances in the mouth. In a GERD case, the defense may examine the observation period, the officer’s notes, the video, and whether any reflux-related event occurred before the sample was taken.
Medical Records Can Change How The Case Looks
Picture a driver with Type 1 diabetes whose blood sugar drops while driving home in Montgomery County. The driver drifts within a lane, gets stopped, and struggles to answer questions. Their hands shake. Their balance is off. Their speech slows down.
An officer may write those symptoms down as signs of intoxication. But glucose records, prescription history, emergency treatment, bodycam footage, and witness statements may tell a different story. What looked like DWI on the roadside may look like hypoglycemia once the evidence is reviewed together.
That’s why timing matters. Medical documentation is strongest when it’s gathered early. If the driver went to a hospital, checked glucose levels, used a continuous glucose monitor, took insulin, ate to correct a low, or had a documented diagnosis, those records may help explain the stop.
How A DWI Defense Challenges Medical Assumptions
A medical-condition defense is not just “I wasn’t drunk.” It needs to be built around evidence that explains the officer’s observations and creates doubt about the State’s theory.
- Review the Stop: Bodycam and dashcam footage may show whether the officer asked about medical issues, injuries, prescriptions, fatigue, diabetes, or balance problems.
- Check the Report Against the Video: The report may describe slurred speech, swaying, red eyes, or confusion differently than the video shows.
- Gather Medical Records: Diagnosis history, glucose logs, prescription records, ER records, and treating-provider notes can support the medical explanation.
- Review Breath or Blood Testing: Blood and breath tests need to be reviewed for timing, procedure, sample handling, and whether the result actually proves intoxication at the time of driving.
- Challenge Breath-Test Issues: Breath testing can raise questions about observation periods, mouth alcohol, operator certification, maintenance, and whether the test result fits the facts.
- Use Medical Testimony When Needed: A treating doctor or qualified medical witness may help explain why the observed symptoms match a health condition.
The defense also needs to review whether the stop itself was lawful. If the traffic stop, detention, field tests, arrest, or chemical test had legal problems, those issues may affect what evidence prosecutors can use.
A DWI Arrest Doesn’t Mean The Evidence Is Strong
A DWI arrest can feel final, but it’s only the beginning of the case. The State still has to prove the charge. If medical evidence explains what the officer saw, prosecutors may have a weaker case than the arrest report suggests.
That’s especially true when the driver’s blood or breath result is low, absent, delayed, or inconsistent with the officer’s description. It’s also true when the alleged signs of intoxication are the same signs a medical condition could produce.
Texas DWI cases are technical. The defense may involve criminal law, medical records, police training, breath-test rules, blood-test procedures, and the exact timing of the stop. That’s why a medical-condition case should be investigated before anyone considers a plea.
Amanda Webb Reviews The Evidence Behind The DWI Charge
If you were arrested for DWI in Conroe, Montgomery County, The Woodlands, or the Houston area, and a medical condition may have played a role, you shouldn’t assume the officer’s interpretation is the final word.
Amanda Webb can review the symptoms the officer described, the testing that was performed, and the medical evidence that may explain what happened. Our firm has obtained DWI dismissals, reductions, pretrial diversion, and other defense results in cases where the evidence needed to be challenged instead of accepted at face value.
You don’t have to plead guilty before every angle is examined. Schedule a free DWI case evaluation with a Conroe DWI lawyer who can start reviewing the stop, the test results, and the medical issues that may affect your defense.
"Wonderful communication, thorough documentation, and pulled out all the best punches. Would recommend them to anyone in a pinch. I know who I'd go to if I got in trouble again; Amanda is an angel." - Andreas B., ⭐⭐⭐⭐⭐



