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Is It Accurate? Not always. There are a few things that could cause an error in the reading. If you had a drink 15 minutes before the test, trace amounts of alcohol in your mouth could lead to an inaccurate result. Smoking can also affect results. Sometimes the machines need to be recalibrated or have batteries replaced. These possibly could affect the reading. Professional breath alcohol tests, like the ones police officers carry, use fuel cell technology. They’re the most accurate.
