I ran across this video from YouTube that actually demonstrates a HGN (horizontal gaze nyustagmus) field sobriety test.  The first minute or so of the video is a discussion about the test, but it then cuts to a video of an actual test.  As noted in our last post, there are many non-alcohol related conditions that can cause nystagmus, and there are numerous defenses to it as well.    

Read more on More on Horizontal Field Nystagmus Testing…

Austin, Texas DWI lawyer Jamie Spencer has written several very interesting posts about a medical condition called nystagmus.  Nystagmus is a medical condition that describes involuntary eye movement, and police officers are trained to look for these involuntary twitches in field sobriety tests as an indication that a driver is impaired.

Read more on Failed Field Sobriety or Nystagmus? Challenge the Arresting Officer's Assumptions…