They are the most common forms of breath alcohol testing. They do not directly measure the blood alcohol content but indirectly measure the amount of the alcohol in the person's breath. In addition to detecting the alcohol in the alcohol beverages, they detect the alcohol in other substances having a similar molecular structure. They could result in false readings caused from cell phones, police radios, electrical interference, moisture, dirt, and tobacco smoke. Further, the compounds found in gasoline, paint removers, cleaning fluids, celluloids and lacquers. The presence of blood, vomit, or alcohol can lead to false BAC results. Holding a person's breath, hyperventilation, or false exercise can also lead to false readings. Failure to recalibrate the instrument when necessary may lead to false readings.
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