What is the required waiting period for a subject prior to test administration?

The required waiting period for a subject prior to the administration of the Intoxilyzer 9000 test is indeed 20 minutes. This waiting period is crucial because it ensures that any residual mouth alcohol from recent consumption does not affect the test results. During this time, the subject should not consume any food or drink, or engage in any activity that might introduce additional alcohol into their mouth or interfere with the test.

By adhering to the 20-minute observation period, the operators can help ensure that the readings obtained are accurately reflective of the subject's blood alcohol concentration at the time of the test. This practice aligns with established protocols for breath alcohol testing to enhance the reliability and validity of the results.