Many. Inner ear disorders and vertigo affect HGN, WAT, and OLS. Lower back, hip, knee, and ankle injuries affect WAT and OLS. Age over 65 and weight over 50 lbs above ideal affect WAT and OLS per NHTSA's own protocols. Diabetic neuropathy affects balance. Certain medications cause natural nystagmus. Head injury history affects HGN. Anxiety affects all three. Documenting these conditions matters.
What medical conditions can cause failure of field sobriety tests?RI DUI Laws2026-10-29T22:17:31+00:00