Field Sobriety Test Demonstration: What is Horizontal Gaze Nystagmus?

The horizontal gaze nystagmus is a field sobriety tests that police use to determine if a driver is intoxicated. Board Certified Defense Attorney Benson Varghese demonstrates the test and explains how to determine if police administered it correctly.
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0:00: What is Horizontal Gaze Nystagmus?
0:31: How drinking affects the eyes (jerking)
1:00: Different types of nystagmus, i.e. rotational nystagmus
2:25: Proper administration of the HGN test
2:35: Qualifying the driver for the test
3:22: Using a stimulus (pen with light)
4:22: Standardized tests
4:40: Demonstration: Checking for equal tracking and pupil size
5:45: Lack of smooth pursuit
7:23: Distinct and sustained nystagmus at maximum deviation
8:49: Onset of nystagmus prior to 45 degrees
9:20: Spotting improper administration testing errors
10:22: Failing the test
10:37: Problem with HGN: Most officers administer it incorrectly
11:27: Audience questions about HGN test

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