After an Austin arrest for driving while intoxicated, a breath test result can become important evidence. However, the result depends on more than a single breath sample. It depends on the device, the operator and the testing procedures followed before and during the test.
Understanding how the Intoxilyzer 9000 works can help you identify the records and safeguards that may provide context for the result.
What happens before and during the test?
Before testing begins, a certified operator must remain in your continuous presence for at least 15 minutes. During that time, the operator must use reasonable care to keep you from placing anything in your mouth. If you do, the waiting period must restart.
The Intoxilyzer 9000 uses infrared spectrometry to measure alcohol in your breath. During a complete test, the machine performs operational checks, analyzes air blanks, verifies calibration with a reference solution and collects two breath samples. The two results must not differ by more than 0.020 grams per 210 liters of breath. If the difference is greater, the instrument stops the test.
What records may raise questions?
Certified personnel must operate the device, while a technical supervisor oversees testing activities and instrument performance. The following materials may show whether those requirements were followed:
- Analytical Report
- Video of the waiting and testing periods
- Operator certification records
- Maintenance and calibration records
- Technical supervisor documentation
Questions may arise if video shows that the waiting period was not restarted when required or if the report does not match the testing sequence. Gaps in operator certification, calibration or maintenance documentation may also call for closer review.
Looking beyond the printed result
A breath test result may seem conclusive, but the supporting records can show how the device was maintained and operated. In an Austin DWI case, reviewing those records may provide a clearer picture of the evidence and the procedures behind it.