Which of the following best describes the testing procedure for the Intoxilyzer 9000?

The testing procedure for the Intoxilyzer 9000 primarily involves the individual breathing into a mouthpiece. This device is specifically designed to analyze the breath of an individual for the presence of alcohol. When a person exhales into the mouthpiece, the Intoxilyzer collects the breath sample and uses infrared spectroscopy to measure the amount of alcohol present in the breath. This method is non-invasive and allows for immediate results, making it a preferred choice for law enforcement when determining blood alcohol concentration.

The other options do not accurately describe the operation of the Intoxilyzer 9000. The procedure does not involve blood samples, urine samples, or scanning of the eyes, as those are not relevant to breath alcohol testing.