A DUI chemical test said I was over the legal limit–but I barely had anything to drink!
It’s many people’s worst nightmare. You’re driving after having had a drink or two–or maybe no drinks at all–and are pulled over. You honestly don’t feel “under the influence” in the slightest. But your performance on your field sobriety tests makes an officer suspicious, you are arrested for DUI—and a DUI breath test or blood test shows that you have a BAC of 0.08 or above.
The phenomenon of “residual mouth alcohol” is one reason why DUI breath test results might show an artificially inflated BAC. This is especially common for people who have gastroesophageal reflux disease (GERD). Basically, if you burp, belch, or regurgitate prior to a DUI breath test, alcohol in the mouth will mix with alcohol from your lungs and make your BAC look much higher than it actually is.
Another medical situation that can lead to artificially high BAC measurements on DUI chemical tests is “ketosis.” Ketosis is common in people with diabetes or hypoglycemia, people who have been fasting, and people who follow low-carbohydrate high-protein diets like Atkins or Paleo. Ketones are a chemical substance released into the breath that can be mistaken by a breath test for the alcohol produced by drinking.
The bottom line is: chemical tests for DUI are not foolproof or infallible! Even when correctly administered, they can produce falsely high BAC results, particularly in people who
have diabetes or hypoglycemia, or
are on a low-carb or fasting diet.
About the Author
A former Los Angeles prosecutor, attorney Neil Shouse graduated with honors from UC Berkeley and Harvard Law School (and completed additional graduate studies at MIT). He has been featured on CNN, Good Morning America, Dr Phil, The Today Show and Court TV. Mr Shouse has been recognized by the National Trial Lawyers as one of the Top 100 Criminal and Top 100 Civil Attorneys.