Breath specimens collected for analysis must be what type of breath?

Breath specimens collected for analysis in the context of the Intoxilyzer 9000 must be expired breath. This is because the Intoxilyzer is designed to measure the ethanol concentration in the air that has been exhaled from the lungs. When a person exhales, the air that is expelled contains vaporized alcohol from the bloodstream, which is what the device is calibrated to analyze.

Expired breath is specifically what is necessary for accurate and reliable readings, as it reflects the breath that has come from the alveoli in the lungs, where oxygen and carbon dioxide exchange occurs. This portion of the breath is vital for providing a representative measure of blood alcohol concentration (BAC).

Other types of breath, such as fresh or filtered, do not contain the same concentration of alcohol vapors since they have not been in contact with the bloodstream in the same way. Condensed breath could also refer to moisture or other components that are not pure air, which would not provide an accurate BAC measurement. Thus, expired breath is the appropriate type needed for the analysis conducted by the Intoxilyzer 9000.