What role do subjective observations play in field sobriety tests?

Subjective observations play a crucial role in field sobriety tests as they contribute significantly to the decision-making process for arrests. During these tests, law enforcement officers assess a variety of indicators, such as a person's balance, coordination, and behavior, which are inherently subjective in nature. These observations help officers gauge whether a driver may be impaired due to alcohol or drugs.

In the context of a DWI stop, an officer's perceptions and interpretations of a person's performance during the tests—like the one-leg stand or walk-and-turn—are essential to understanding the driver's level of impairment. These subjective assessments complement more objective measures, like Breathalyzer results, to form a comprehensive basis for making an arrest decision.

This means that while subjective observations are one piece of the puzzle, they are not the only determinant of impairment, which is why they are not the sole basis for determining if someone is under the influence. Instead, they work alongside other evidence to support an officer's rationale for arresting an individual suspected of driving while intoxicated.