VGN – Vertical Gaze Nystagmus Test – Sobriety Test – Field Sobriety Test – Nystagmus Causes – HGN Test and VGN (Vertical Nystagmus) Test
By: DUI lawyer Atlanta William C. Head
Law enforcement training for virtually every sheriff deputy, county law enforcement officer, local cop, state highway patrol trooper or any other law enforcement officer usually includes learning about the multiple HGN clues or “cues” from VOLUNTARY lateral gaze nystagmus eye tests. Officers trained since 2002 have had to also learn the VGN vertical gaze nystagmus test, which was added to the police protocols for properly administering the NHTSA field sobriety tests.
The information on “accuracy” of these evaluations, which is taught to and used by police, came from Dr. Marcelline Burns (creator of the field sobriety test “battery”) and her team of paid experts who were all Ph.D. psychologists (or candidates for a Ph.D) in southern California. NONE of the researchers were qualified as medical experts in eye functions or eye diseases. This was determined in an appellate court holding in a New Mexico Court of Appeals decision, State v. Lasworth, 131 N.M. 739, 42 P.3d 844 (N.M. App., 2001)
Should I take the DUI eye test – HGN test or the VGN test?
You should DECLINE taking either, due to the very high false positive (false arrest) likelihood. Plus, since the medical tests possibly are being administered sometimes by a person with only a high school education and no scientific or medical background whatsoever, do you want this bogus evidence to be part of the “proof” in YOUR criminal court trial?
Doctors do not use HGN or VGN to identify or measure ANYTHING relating to alcohol intoxication.
Additionally, no board-certified ophthalmologist would EVER approve of a layman doing these DUI eye test maneuvers to help make an arrest decision. Your Atlanta DUI lawyer knows which DUI expert witness to use to refute the scientific reliability of standardized field sobriety tests.
HGN Test – Nystagmus test – Sobriety test – NHTSA (National Highway Traffic Safety Administration) – standardized field sobriety test – nystagmus causes jerking within the eyes
Police officers use the standardized field sobriety tests that should include HGN [horizontal gaze nystagmus] screening and (after the HGN field sobriety test) conduct a two-pass (up and down twice) check to look for the presence of VGN [vertical gaze nystagmus]. This second part of the nystagmus test is an essential part of the NHTSA standardized field sobriety test as well as the IACP/NHTSA drug recognition tests given by DRT [DRE] cops.
Their goal is to TRY to identify DUI-DWI suspects who have a sufficient quantity of alcohol to be a “high dose” for that individual, or the presence of 1 of the 7 DRT classifications of drugs (PCP), or both. The problem with this is that NO DOCTOR would ever make such a guess, even though his or her medical training far exceeds that of all the DRE officers in America.
Vertical Gaze Nystagmus – VGN – The second nystagmus test given after getting four (4) or more clues on the HGN test
The Vertical Gaze Nystagmus test – VGN – is the second nystagmus test given by a law enforcement officer after getting 4 or more clues on the HGN test. This short YouTube video shows the eye movements that indicate VGN symptoms: Vertical Gaze Nystagmus Video
Like horizontal gaze nystagmus, vertical nystagmus or vertical GAZE nystagmus [VGN] CAN be caused by central nervous system depression. However, both DUI eye test evaluations for nystagmus causes are “overly sensitive” because they often incorrectly identify sober drivers as being “an arrest decision”, along with DUI suspects who are “over the legal limit.” The VGN part of standardized field tests comes after the horizontal gaze nystagmus [HGN] evaluation is concluded.
Officers in the NHTSA standardized field sobriety courses are taught that a DUI suspect that has VGN “nystagmus causes” has either a high dose of alcohol for that particular individual’s tolerance level, or is high on PCP.
Both HGN test and VGN test results are supposed to be recorded in the police report.
Officers are also trained to not look for VGN (vertical gaze nystagmus) until they have first evaluated horizontal gaze nystagmus in the suspect. Then, the officer changes direction and movement of the stimulus from side to side (lateral movement) to moving it in a vertical manner, while the suspect keeps his or her head still, and looks UP and DOWN following a moving stimulus.
How to Beat the HGN or VGN Field Sobriety Test At Trial
See Mr. Head’s VALUABLE DUI lawyer article on beating the field sobriety tests at a DUI trial and the sordid history of how police were allowed to use a medical eye test to make their drunk driving arrests, even when nearly 50% of the time, improper administration of the various “passes” of the stimulus create false positives to occur (people who are under the legal limit are “identified” as being DUI, and falsely arrested).
See another DUI lawyer video about the field sobriety test known as the horizontal gaze nystagmus.
Demystifying the Vertical Gaze Nystagmus test (VGN)
During your FREE professional consultation with Atlanta DUI Attorney William C. Head, he will explain how the VGN test is different from the HGN test. Neither DUI eye test is scientific, in terms of proving driving impairment. Contact Atlanta DUI Lawyer and DUI lawyer William C. (Bubba) Head – 1-888-384-4323 Toll Free [1-888-DUI-HEAD].
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Call 42-year veteran Atlanta DUI attorney Bubba Head today and get honest answers to all your questions. Tell us everything that happened and everything you remember about your DUI arrest. The sooner you call us, the better chance we have to win your DUI case and get your charges reduced or dismissed.
Remember, you only have 30 DAYS to file a license suspension appeal or apply for an ignition interlock device, or your driver’s license will be suspended for up to one year! Talk to Bubba Head, Larry Kohn, or Cory Yager now. We are available 24 hours a day, weekends, and all major holidays. (404) 567-5515