Reflux Linked to False Breath-Alcohol Readings
A May 2026 report found that gastroesophageal reflux may affect DUI breath tests for Minnesota drivers.
Updated on Oct. 2, 2026 in Asthma
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A forensic report published on May 4, 2026, detailed two cases where drivers in Minnesota recorded elevated breath-alcohol levels potentially linked to gastroesophageal reflux disease. The findings suggest that microaspiration during coughing episodes could contaminate breath samples.
Why it matters
The study highlights a potential challenge in the accuracy of breath-alcohol testing for the roughly 20 percent of Americans living with chronic acid reflux. This condition can cause stomach fluids to enter the airways, possibly skewing forensic results.
One subject recorded 37 distinct coughing or throat-clearing events during the observation period. Breath-alcohol levels for the two drivers were measured at 0.14 and 0.11 grams per 210 liters.
The players
Medico-Legal Journal
This is a peer-reviewed publication that covers the intersection of medical practice and the legal system.
The details
The report indicates that microaspiration allows gastric contents to reach the airways, where alcohol-containing fluid can be brought forward during coughing or throat clearing. This mechanism potentially impacts breath sample integrity despite the standard 20-minute police observation period.
Timeline
A 1999 study examined GERD patients and breath tests.
Alcohol-impaired traffic deaths reached 11,904 in 2024.
The case series on detection system limits was published in 2025.
The forensic report was published on May 4, 2026.
The Big Picture
This case series updates the 1999 study of 10 people with severe gastroesophageal reflux disease by providing new documentation that challenges earlier findings that false positives were improbable.
Individuals with chronic acid reflux may face complications during routine breath-alcohol tests if they experience coughing or throat clearing. Patients concerned about potential testing inaccuracies should consult with their healthcare provider regarding their specific condition.
The takeaway
Understanding the physical limitations of breath-alcohol testing is essential for interpreting forensic results accurately. Future research may clarify how common respiratory conditions influence the reliability of these measurements in a legal context.
Further reading
Learn more about respiratory conditions and diagnostic accuracy in the Minnesota Asthma section.
Source note: This article includes information reported by Medical Daily.
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