Test Legend:

• HGN: Horizontal Gaze Nystagmus
• WAT: Walk and Turn
• OLS: One-Leg Stand

Disclaimer: This tool provides a statistical estimation based on field sobriety test clues from NHTSA-sponsored studies. It does not measure actual BAC. Results assume strict adherence to standardized test procedures. Performance can be affected by age, weight, fatigue, injury, medical conditions, and environmental conditions. Field sobriety tests correlate with but do not directly measure driving impairment. Always refer to official chemical testing for legal determinations. This estimator is for informational purposes only and should not be relied upon for legal decisions.