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.
Filed under Arrest issues, Field sobriety tests by 
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.
More on Failed Field Sobriety or Nystagmus? Challenge the Arresting Officer's Assumptions
Filed under Field sobriety tests, pre trial motion by
