| Posted: 08 July 2008 at 3:01pm | IP Logged
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NHTSA did a study on the effectiveness of the HGN test. Follow the link below to read the results in a paper titled "The Robustness of the Horizontal Gaze Nystagmus Test in Standardized Field Sobriety Tests."
http://www.nhtsa.dot.gov/staticfiles/DOT/NHTSA/Communication %20&%20Consumer%20Information/Traffic%20Tech%20Publicati ons/Associated%20Files/tt339.pdf
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