Breath test machines are notoriously thrown off by radio frequency interference from car radios, microwave ovens and cellular phones. They are also poor at detecting mouth alcohol that contaminates the breath sample. If you blow into the machine when you have residual alcohol in your mouth, the machine will register the mouth alcohol, greatly inflating your BAC. There are dozens of causes of mouth alcohol, including:
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→ GERD/acid reflux
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→ Dentures or dental cavities
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→ Faulty slope detector
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→ Elevated body temperature
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→ Asthma inhalants
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→ Interfering substances caused increased BAC
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→ Ketosis caused by high-protein diets
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→ Radio frequency interference