What is a critical step before administering a test with the Intoxilyzer 9000?

Before administering a breath test with the Intoxilyzer 9000, it is essential to ensure that there is no residual alcohol present in the mouth of the test subject. This step is crucial because any alcohol lingering in the mouth can lead to false readings. If alcohol is present, it may result in a higher breath alcohol concentration measurement than what is actually present in the bloodstream, skewing the results of the test.

This procedure typically involves a waiting period of at least 15 minutes, during which the officer monitors the individual to confirm that no food, drink, or other substances that could contain alcohol are consumed, and to allow any residual alcohol to dissipate. This confirms the accuracy of the test, as it measures only the alcohol that is in the blood, not what may be temporarily lodged in the mouth. Ensuring this step is followed is fundamental to the integrity of the testing process and is a routine part of proper protocol in administering breath tests.