HORIZONTAL GAZE NYSTAGMUS: THE SCIENCE & THE LAW
A Resource Guide for Judges, Prosecutors and Law Enforcement

Note: This is prosecution oriented information written with a view towards law enforcement and justification of the HGN tests. Please be aware that HGN testing as a field sobriety test is fraught with problems, inaccuracies, false and voodoo science, and just plain misunderstanding in its administration and application