How do the results of the One Leg Stand test impact law enforcement decisions?

The results of the One Leg Stand test serve as an important indicator in the assessment of a driver’s level of impairment. When a law enforcement officer administers this test, they are looking for specific cues related to balance, coordination, and overall physical ability, which can be affected by alcohol consumption. If a subject displays difficulties in performing the One Leg Stand test, such as swaying, putting their foot down, or losing balance, these observations suggest that the individual may be impaired.

In these instances, the performance on the test can provide sufficient justification for the officer to suspect further alcohol intoxication and therefore the need for additional testing. This may include administering other Standardized Field Sobriety Tests (SFSTs) or a breathalyzer to assess Blood Alcohol Concentration (BAC). The results of this test are not definitive proof of intoxication in themselves; rather, they are a part of a broader assessment strategy guiding the officer's next steps in the investigation.

Other options do not align with the purpose of the One Leg Stand test. For example, it does not determine vehicle registration status nor establish BAC directly without corroborating evidence. While it might indicate the need for a breathalyzer, it primarily facilitates the decision-making process towards further testing and evaluation to