What can a police officer's testimony about a driver's behavior or appearance result in?

A police officer's testimony about a driver's behavior or appearance can play a significant role in legal proceedings, particularly in DUI cases. When an officer observes erratic driving, slurred speech, poor coordination, or other indicators of intoxication, their observations can be compelling evidence even in the absence of a blood alcohol concentration (BAC) reading. Courts recognize that the officer's professional training and experience allow them to draw conclusions about a driver's level of impairment based on behavior.

The testimony about the driver's demeanor and actions can contribute significantly to establishing probable cause for the arrest and can influence the verdict in a trial. This means that even without a BAC measurement, the officer's observations can lead to a conviction for driving under the influence. Thus, the correct answer underscores the importance of an officer's observations in influencing the legal outcomes for drivers suspected of impairment.