& MISCONCEPTIONS BREATH TESTING
BY AMY EVANS AND BARRY KNOTT, LIFELOC TECHNOLOGIES 1 Confusing a Calibration with a Calibration Check
The steps required to perform a calibration check (also known as a “verification,” “cal check,” “external calibration check,” or “accuracy check”) can be similar to the steps of an Evidential Breath Tester calibration. It is not uncommon for an inexperienced or flustered BAT to inadvertently or unknowingly perform a calibration after a positive test. This is the fastest
way to discredit an otherwise properly conducted positive confirmation test. Here’s why:
Calibrating an evidential breath tester sets the BAC measurement of the instrument to a known alcohol concentration from a dry gas mixture of alcohol and nitrogen, or from a wet bath solution of alcohol and water. Calibrating an EBT is comparable to setting your watch to the time you know to be correct from an independent source.
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