The Science Behind HGN in Driving Under the Influence Cases by Herring & Herring Law | Nov 1, 2013 | Florida Legal News, UncategorizedIf you have been stopped by police in Seminole County, Florida and ultimately accused or charged with DUI, beware of the “HGN Exercise” or “pen test”. Court’s in Sanford, Florida have wrestled with admitting this test into evidence. In...