What are two factors that can lead to high results on a Preliminary Breath Test (PBT)?

The correct answer identifies the factors of residual mouth alcohol and stomach contents as contributors to high results on a Preliminary Breath Test (PBT). Residual mouth alcohol can lead to false positives because alcohol from recent consumption can remain in the mouth and contaminate the breath sample, artificially elevating the reading. Stomach contents can also influence breath alcohol concentration because alcohol can be present in the breath due to its absorption from the stomach, impacting the accuracy of the PBT result.

Understanding these factors is crucial for interpreting PBT results accurately, as they can lead to misleading evidence of intoxication if not accounted for.