What action is warranted if the Intoxilyzer 9000 reports inconsistent readings?

When the Intoxilyzer 9000 reports inconsistent readings, inspecting the device for malfunctions is a warranted action. Inconsistent results can indicate potential issues with the instrument's calibration, software, or hardware. Ensuring that the device is functioning correctly is crucial for maintaining the accuracy and reliability of the test results. A thorough inspection might involve checking for any mechanical failures, verifying that the device is properly calibrated, and ensuring that all components are in good working condition.

The other options suggest actions that do not adequately address the underlying issue of inconsistencies. Trusting the readings without investigation can lead to misinterpretation of alcohol consumption, which may have serious legal consequences. Conducting a manual test could potentially be a secondary step but does not address the need to first ensure that the device itself is not malfunctioning. Ignoring the readings is not appropriate, as these readings hold significant relevance for assessing a person’s blood alcohol concentration. Therefore, inspecting the device stands as the most logical and responsible course of action.