What type of sample is essential for accurate BAC measurement using the Intoxilyzer 9000?

The Intoxilyzer 9000 measures Blood Alcohol Concentration (BAC) by analyzing a deep lung breath sample. This is essential because the alcohol in the bloodstream exerts vapor pressure, allowing it to be exhaled in the breath. Deep lung samples provide a more accurate representation of the blood alcohol level because they originate from the alveoli, the small air sacs in the lungs where gas exchange occurs.

In contrast, other types of samples, such as saliva, urine, or blood from a finger prick, do not directly measure the concentration of alcohol in the breath and can lead to inaccurate readings due to factors such as metabolism, time elapsed since consumption, or the way the body processes alcohol. Therefore, the deep lung breath sample is specifically designed to give a reliable measure of BAC, making it the preferred and essential method for the Intoxilyzer 9000.