What is a common practice before starting a breath alcohol test?

Prior to commencing a breath alcohol test, it is essential to verify that the Intoxilyzer 9000 device is functioning correctly. This step ensures that the readings obtained during the test will be accurate and reliable. A properly functioning device is critical in maintaining the integrity of the testing process and the results it produces. This verification can include checking for any error messages, ensuring that the mouthpiece is clean and in good condition, and confirming that the device has undergone regular maintenance as stipulated by relevant regulations.

While options related to conducting an employee report, informing subjects about their expected results, and calibrating the device are relevant in other contexts, they do not directly pertain to the immediate preparatory steps taken right before starting the breath alcohol test. Ensuring the device's functionality is the foremost priority to uphold the testing standards and achieve valid results.