What type of calibration is necessary for the Intoxilyzer 9000?

The Intoxilyzer 9000 requires three-point calibration to ensure accurate measurement of blood alcohol content (BAC). This method involves using three different known concentrations of alcohol to create a calibration curve. The three points help to establish the device's accuracy across a range of ethanol concentrations, providing a more precise calibration compared to one-point or two-point calibrations.

One-point calibration would only check the accuracy at a single concentration, which could lead to significant errors if the sample being tested is outside that concentration range. Two-point calibration improves on this but may still not be sufficient to account for variations in sensor performance over a wider range of concentrations. The three-point calibration method is more robust, accounting for potential non-linearities in the sensor's response to ensure that the readings at various levels of concentration are both accurate and reliable. This thorough approach is essential for maintaining the integrity of breath alcohol testing and ensuring that the results are legally defensible in court.