What is the maximum allowable difference between two breath samples during a BrAC measurement?

The correct answer is 0.020. In breath alcohol testing using devices like the Intoxilyzer 9000, accuracy and consistency of the readings are crucial for ensuring reliable results.

A maximum allowable difference of 0.020 means that if two consecutive breath samples are taken, the results of those samples can vary by no more than 0.020 grams of alcohol per 210 liters of breath for the tests to be considered valid and reliable. This threshold helps minimize the impact of potential errors or variations in testing conditions, ensuring that the results are consistent and within an acceptable range for legal and evidential purposes.

Understanding this value is essential because, in the context of DUI enforcement, it reflects how variations will be handled legally. Measurements that exceed this difference may indicate a potential issue with the testing procedure or the device itself, prompting further investigation or retesting.