WHAT IS THE Horizontal Gaze Nystagmus Field Sobriety Test?
The HGN Test is "the most reliable" of the 3 approved NHTSA Standardized Field Sobriety Tests --as it is supposed to measure your body's INVOLUNTARY response to consuming alcohol by checking your eyes.
The Police officer is looking for an involuntary jerking of your eyes to see if you are under the influence of alcohol.
However, there are many problems with this test as I will discuss in future videos. Nystagmus (or jerking) can be caused by MANY things --and the test itself must be done correctly for it have any reliability at all. Also, everybody has different degrees of nystagmus even when SOBER. So, the HGN is not infallible as a prosecutor would have you believe.
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