Which of the following is a safeguard against mouth alcohol?

Which of the following is a safeguard against mouth alcohol?

• A. Slop of breath sample
• B. Calibration checks
• C. 15 minute observation period
• D. Subsequent tests within .02

Answer: (D)

The main idea here is protecting the breath test result from being skewed by alcohol already present in the mouth. Mouth alcohol can produce artificially high readings, especially if someone has recently consumed alcohol or used mouth products. The most effective safeguard is requiring subsequent breath tests to be within a very close range, specifically within 0.02 g/210 L. If the next tests land in that narrow band, it strongly indicates the reading reflects true alveolar air rather than a mouth-alcohol artifact. If the results drift beyond that margin, it signals a potential mouth alcohol issue and the test should be repeated or handled per protocol. Calibration checks and waiting periods are important parts of the process, but they don’t address mouth alcohol as directly as ensuring consecutive results stay within a tight margin.

The main idea here is protecting the breath test result from being skewed by alcohol already present in the mouth. Mouth alcohol can produce artificially high readings, especially if someone has recently consumed alcohol or used mouth products. The most effective safeguard is requiring subsequent breath tests to be within a very close range, specifically within 0.02 g/210 L. If the next tests land in that narrow band, it strongly indicates the reading reflects true alveolar air rather than a mouth-alcohol artifact. If the results drift beyond that margin, it signals a potential mouth alcohol issue and the test should be repeated or handled per protocol. Calibration checks and waiting periods are important parts of the process, but they don’t address mouth alcohol as directly as ensuring consecutive results stay within a tight margin.