Medical Conditions That Can Mimic DWI Symptoms in New Jersey

How GERD and Acid Reflux Can Distort a Breath Test Reading

GERD — chronic acid reflux — involves a weakened or dysfunctional lower esophageal sphincter, the valve that's supposed to keep stomach contents from moving back up into the esophagus and throat. When that valve doesn't close properly, stomach-sourced alcohol vapor can migrate into the mouth, a phenomenon generally referred to as mouth alcohol contamination. A breath-testing device isn't able to distinguish between alcohol absorbed into the bloodstream and metabolized normally, and alcohol sitting in the mouth or throat from reflux. It measures whatever passes through the sample chamber. That means a genuine reflux episode at or near the time of testing can artificially inflate a reading — sometimes significantly.

This isn't a fringe theory. It's a documented issue in breath-testing science generally, and it's specifically why observation protocols exist before a sample is taken in the first place.

New Jersey's Observation Period Doesn't Catch Every Case

New Jersey's Alcotest protocol, established through State v. Chun, requires the operator to continuously observe the person for at least 20 minutes before a valid sample can be taken, specifically to confirm that nothing enters the mouth — no belching, vomiting, regurgitation, food, drink, gum, or smoking — that could contaminate the reading. See our page on challenging the Alcotest in New Jersey for the full breakdown of that requirement and what the surrounding paperwork has to show.

The problem is that reflux doesn't always announce itself. Many GERD episodes are silent — no audible belch, no visible sign, nothing an operator watching for overt indicators would necessarily catch — which means an operator can conduct the observation period exactly as required and still miss a contamination event they had no reasonable way to detect. That's not a flaw in the officer's conduct; it's a limitation of what a visual observation period can actually rule out. It's also exactly why a documented GERD diagnosis is relevant to a defense review of the breath-test result, independent of whether the observation period was properly documented.

Conditions That Can Affect Field Sobriety Test Performance

Field sobriety tests — the walk-and-turn, the one-leg stand, horizontal gaze nystagmus — are built around assumptions about balance, coordination, and eye movement that a number of unrelated conditions can affect:

• Inner-ear and vestibular disorders can affect balance and cause a wavering or unsteady gait unrelated to any impairment.
• Old knee, hip, ankle, or back injuries can make the one-leg stand or walk-and-turn genuinely difficult to perform even while completely sober.
• Neurological conditions, including multiple sclerosis and certain other movement disorders, can affect coordination and speech in ways that overlap with what officers are trained to flag.
• Fatigue, allergies, or minor eye conditions can produce red, watery, or glassy eyes — one of the roadside signs officers commonly note — without alcohol as the cause.

None of this means field sobriety results are automatically unreliable. It means the state's characterization of "failed" performance deserves scrutiny when a documented condition offers an alternative explanation. See our page on field sobriety tests in New Jersey for how these tests are supposed to be administered and scored.

Diabetes and Blood Sugar

Low blood sugar, or hypoglycemia, is a well-recognized cause of confusion, slurred speech, poor coordination, and even disorientation — a symptom cluster that overlaps substantially with the signs officers are trained to associate with intoxication. Separately, diabetic ketoacidosis, a serious complication of unmanaged diabetes, can produce a distinctive fruity or acetone-like breath odor that has been mistaken for alcohol in documented cases. Neither of these is a guarantee that a breath test itself will read incorrectly; the more direct issue is that the roadside signs an officer relies on to justify further testing in the first place can be produced by a medical event that has nothing to do with drinking.

This Is a Defense Consideration, Not an Automatic Dismissal

Raising a medical condition as part of a defense isn't a matter of simply telling the officer, or later telling the court, that a condition exists. It requires actual documentation — medical records, a diagnosis history, medication records, or a statement from a treating physician connecting the condition to the specific symptoms observed. A DWI case built on a genuine, documented medical explanation is a materially different case than one built on an undocumented claim raised for the first time in court. And a medical explanation for one piece of evidence — say, a breath-test reading — doesn't automatically dispose of everything else the state gathered; it's a factor that gets weighed against the rest of the file, including whatever the discovery shows about the stop itself. See our page on getting discovery in a New Jersey DWI case for what that full review typically covers.

What to Bring to a Consultation If a Medical Condition Was a Factor

• Your diagnosis history, including when the condition was first documented and by whom.
• Current medications and dosages, especially anything affecting blood sugar, digestion, balance, or coordination.
• Any records from an ER visit, urgent care, or your primary care provider close in time to the arrest, if applicable.
• Your own written account of what you were experiencing physically during the stop, while the memory is still fresh.

If breath-test medical incapacity — a physical inability to complete the test itself, as opposed to a condition that distorts the reading or the roadside observations — is closer to your situation, see our separate page on being medically unable to complete a breath test in a New Jersey DWI case, which covers respiratory and pulmonary conditions specifically.

This page describes general medical and forensic concepts relevant to DWI defense and is not medical or legal advice. Whether a specific condition applies to your case depends on your documented medical history and the facts of your stop — consult a licensed New Jersey attorney and your treating physician.