False positives occur on DWI breathalyzer tests more often than you might think. Breathalyzer testing equipment always comes with its margin of error, and the test is administered by a person who is not infallible. A lesser-known potential cause of a false positive on a DWI test is the diet of the person being tested. For example, a keto diet, low carb diet, or intermittent fasting may cause false positives on DWI breathalyzer tests.
The Problem with Ketosis Breath
When we eat keto-based foods, such as nuts, berries, lean meat, fatty fish, and fresh greens, our bodies break them down into ketones, which have a chemical compound similar to isopropyl alcohol. This process is called ketosis, and the rate at which it occurs varies by person.