During the Horizontal Gaze Nystagmus (HGN) test, how long should maximum deviation be maintained?

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In the Horizontal Gaze Nystagmus (HGN) test, maximum deviation should be maintained for a duration of 4 seconds. This is an important aspect of the HGN test, which is used by law enforcement officers to help identify potential impairment due to alcohol or other substances.

Maintaining the gaze at maximum deviation for 4 seconds allows for a proper assessment of the nystagmus, which is the involuntary jerking of the eyes when they are moved horizontally. If the deviation is held for a shorter period, it may not provide sufficient time to observe the full extent of the nystagmus, potentially leading to inaccurate conclusions regarding impairment.

The 4-second duration is a standardized measure that ensures consistency in testing, which is crucial for reliable results that can be used in investigations and court proceedings.