How Reliable Are the Standard DWI Field Tests?
Wake County police officers routinely use three Standardized Field Sobriety Tests (SFSTs) to measure impairment in individuals suspected of driving while impaired. The three tests are: Horizontal Gaze Nystagmus Test (HGN), which purportedly measures impairment by revealing “jerkiness” in eye movement while the eyes track an object Walk-and-Turn test (WAT) One-Leg-Stand (OLS) The results of these tests, as reported...
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