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At a BAC cutoff of 0.08%, the Likelihood Ratio of the SFST is 1.4. CONCLUSION The statistics overall accuracy and arrest accuracy to not quantify the probability that impaired driving defendants who failed the SFST had an elevated BAC or were impaired.
Your Best Source for SFST Science.. SFST.US is your best resource for understanding the science underlying US law enforcement's Standardized Field Sobriety Test. We'll focus on the question relevant to DUI prosecutions:
Given that our driver failed the scientific SFST , what is the probability she was impaired by alcohol?