What is the measurement uncertainty exhibited by breath testing instruments in Georgia?

Breath testing instruments, such as the Intoxilyzer 9000 used in Georgia, exhibit a measurement uncertainty of +/- 5%. This value indicates that the actual blood alcohol concentration (BAC) could realistically fall within ±5% of the reading provided by the device.

Understanding measurement uncertainty is essential for interpreting breath test results accurately. A device displaying a BAC of 0.10%, for example, may reflect a true BAC between 0.095% and 0.105%. This level of uncertainty is crucial in legal contexts, as it acknowledges that breathalyzer readings are not absolute and can vary, which can play a significant role in DUI cases.

Other values, like +/- 3%, +/- 4%, and +/- 6%, do not represent the established measurement uncertainty for the Intoxilyzer 9000. Different devices or methods might demonstrate these levels, but for the Intoxilyzer 9000 specifically as used in Georgia, the accepted uncertainty is +/- 5%. Understanding this standard helps to grasp the reliability of breath analysis in legal situations involving alcohol testing.