Acid Reflux And Breath Tests In Ohio DUI/OVI Cases

Somewhere between ten percent and twenty percent of Americans have GERD: Gastro Esophageal Reflux Disease. While the advertisements by pharmaceutical companies have made GERD common knowledge, it is no so commonly known that this medical condition can inflate the result of an alcohol breath test. When the defendant in an OVI case has GERD, lawyers and judges find themselves at the intersection of law and science.

Science was not my best academic subject. In high school, I was one of only two people in the chemistry class not invited to the take physics. In college, I was required to take a few science courses, and I studied diligently…to find out which courses were the easiest! As a criminal defense lawyer, I was not thrilled to realize that developing expertise in DUI/OVI defense requires at least some comprehension of anatomy, physiology, chemistry, and pharmacokinetics. Although I am far from being a scientist, I have learned enough about the scientific aspect of DUI/OVI cases that I was recently asked to speak at a seminar on the topic of “Presenting A GERD Defense: Law And Science”.

GERD-ethanol exchange in the lungs

Recognizing how GERD affects alcohol breath tests requires understanding how alcohol reaches human breath. Alcohol is absorbed into the bloodstream, mostly in the intestines and some in the stomach. Blood carries the alcohol to different parts of the body, including the lungs. In the lungs, small blood vessels wrap around the ends of the bronchial trees; the alveolar sacs. At the alveolar sacs, gases from the blood, including alcohol, go into the lungs. Those gases, including alcohol, are then exhaled. If a person is taking a breath test, those gases are exhaled into the mouthpiece of a breath-testing machine.

The breath-testing machine is supposed to measure alcohol from the lungs only. For people with GERD, however, alcohol from their stomach is getting added to the alcohol from their lungs. At the bottom of the esophagus, there is muscle tissue, the lower esophageal sphincter, which prevents stomach contents from going back up the esophagus. For people with GERD, the lower esophageal sphincter does not close all the way, and gases (as well as liquids) from the stomach leak up the esophagus. Those gases include alcohol.

GERD-digestive and respiratory systemsAlcohol vapors from the stomach go up the esophagus, meet with alcohol vapors from the lungs, and both are exhaled together into the breath-testing machine. The machine doesn’t know where the vapors came from; it just measures the alcohol exhaled into the mouthpiece. Consequently, what should be a measurement of alcohol from the lungs is falsely elevated by alcohol from the stomach.

Although the impact of GERD on the breath test is understood, it’s not always accepted by lawyers and judges. Based on the 30-year-old case of State v. Vega, some lawyers and judges believe a defendant may not question the accuracy of the defendant’s breath test. What Vega really says is the defendant may not attack the general reliability of the breath-testing machine. Vega does not prohibit evidence showing the specific breath test in the defendant’s case yielded an inaccurate result.

Thankfully, this was clarified in the recent case of Cincinnati v. Ilg. In Ilg, the Ohio Supreme Court stated a defendant is permitted to challenge “the accuracy, competence, admissibility, relevance, authenticity, or credibility of specific test results….”

It should now be clear that a person charged with OVI is permitted to demonstrate the result generated by the breath-testing machine does not accurately reflect his or her true breath alcohol concentration. A trial is intended to be a search for the truth, and the truth is GERD can falsely inflate a breath test result. It is not an issue in every case, but for the ten to twenty percent of people with GERD, it’s a viable defense.