A Brief on Horizontal Gaze Nystagmus in Vermont DUI Investigations What is Horizontal Gaze Nystagmus (HGN)? The definition of nystagmus is a “rapid involuntary movement of the eyes.” This could be side to side, up and down, or circular movements of the eyes. This is due to brain disease or inner ear balance. Brain disease…
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for Progressive Justice.
for Progressive Justice.








