How GERD and Acid Reflux Can Cause False DUI Breath Test Results in New Jersey

When you are pulled over for suspected drunk driving, the police heavily rely on the Alcotest 7110 machine to measure your Blood Alcohol Concentration (BAC). While the state treats this machine as highly accurate, it has a major scientific flaw: it cannot tell the difference between air from your deep lungs and vapor coming from your stomach. For the millions of Americans who suffer from chronic digestive issues, this flaw can turn one glass of wine with dinner into an unjust DUI arrest.

If you have been diagnosed with Gastroesophageal Reflux Disease (GERD) or a hiatal hernia, your medical history might be the key to your defense. Whether your case is pending in the Toms River Municipal Court, Toms River or the Cherry Hill Municipal Court, Cherry Hill, you need to show the judge that the machine misread your biology. You can find an aggressive DUI defense lawyer in our US Lawyers Directory who knows how to utilize medical evidence. This guide explains how digestive conditions create false DUI readings and how to build your defense.

The Science of Mouth Alcohol

To understand the GERD defense, you must first understand how a breathalyzer is supposed to work. The Alcotest machine is calibrated to measure "alveolar air"-the air deep inside your lungs that absorbs alcohol from your bloodstream. The formula assumes that the breath you blow into the tube comes exclusively from your lungs.

However, if there is even a microscopic amount of raw alcohol vapor lingering in your throat or mouth, the machine will mix it with your lung air. Because mouth alcohol is undiluted, even a tiny amount will exponentially spike the final BAC reading. New Jersey's DUI statute, N.J.S.A. § 39:4-50, punishes people based on their actual blood-alcohol level, not the amount of alcohol vapor sitting in their esophagus.

Common Medical Conditions that Cause False Positives

Several common medical conditions physically prevent the lower esophageal sphincter (the muscle that separates your stomach from your throat) from closing properly, allowing mouth alcohol to constantly contaminate your breath.

Gastroesophageal Reflux Disease (GERD)

GERD is a chronic form of acid reflux. If you suffer from GERD, the contents of your stomach frequently flow backward into your esophagus. If you had a single beer or a glass of wine with your meal, the alcohol mixes with your stomach acid. Due to GERD, that alcohol-laced vapor constantly burps up invisibly into your throat and mouth. When you blow into the Alcotest, it measures the raw stomach alcohol, resulting in a false reading that makes you look heavily intoxicated when you are actually perfectly sober.

Hiatal Hernias

A hiatal hernia occurs when the upper part of your stomach pushes through your diaphragm and up into your chest cavity. This condition severely weakens the valve separating your stomach and esophagus. People with hiatal hernias are prone to severe, "silent" reflux. Because the stomach is physically out of position, the vapor flow is continuous, and standard police procedures (like the 20-minute observation rule) cannot prevent the contamination of the breath sample.

Heartburn Medications

The medications you take can also play a role. Over-the-counter antacids (like Tums) or prescription proton pump inhibitors (like Prilosec or Nexium) alter the pH levels of your stomach. Sometimes, this allows alcohol to remain undigested in the stomach longer, meaning the vapor continues to rise into the throat hours after you finished your last drink, catching you off guard during a late-night traffic stop.

Using Medical Expert Testimony in NJ

You cannot simply walk into a New Jersey Municipal Court, tell the judge you have heartburn, and expect the case to be dismissed. Proving a medical defense requires sophisticated expert testimony.

Your attorney will need to obtain your official medical records, including endoscopy results or physician notes detailing your long-standing GERD or hernia diagnosis. Then, your attorney will hire a forensic toxicologist or a gastroenterologist to testify as an expert witness. The expert will review the Alcotest data and explain to the judge scientifically how your specific biological condition caused the Alcotest machine to malfunction and record mouth alcohol instead of deep lung air.

Costs and Timeline

Mounting a highly technical medical defense is an investment in protecting your permanent record and your driving privileges.

• Legal Fees: Hiring an experienced DUI attorney to litigate a complex medical defense usually costs between $4,500 and $8,000.
• Expert Witness Fees: Medical experts and forensic toxicologists charge substantial fees for reviewing records, writing reports, and testifying in court, typically ranging from $2,500 to $5,000.
• Timeline: Because scheduling expert witnesses and dealing with medical records takes time, cases involving a GERD defense often take 6 to 9 months to be resolved in the Municipal Court system.

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