What does the Intoxilyzer 9000 specifically measure in a breath sample?

The Intoxilyzer 9000 is specifically designed to measure the presence of ethanol, the type of alcohol found in alcoholic beverages, in a breath sample. It utilizes infrared spectroscopy to detect and quantify the concentration of alcohol vapor in the breath, providing a numerical result that correlates to blood alcohol content (BAC). This focus on measuring ethanol is crucial for law enforcement and legal proceedings related to driving under the influence of alcohol.

The other options refer to factors not measured by the Intoxilyzer 9000. While temperature and other substances may be relevant in different contexts, the device's primary function remains the detection and quantification of alcohol. Consequently, the correct answer centers on the ability of the Intoxilyzer 9000 to identify the presence of alcohol in breath samples.