Governor's Traffic Safety Committee

New York State's Drug Recognition Expert (DRE) Program

Horizontal Gaze Nystagmus (HGN) Training

This course covers the following topics: significance of eye movements and pupil responses for driving; basic anatomy, physiology, and neurology of the visual system; effects of drugs and environmental conditions on visual responses; and review of recent changes in the DRE protocol for testing eye movements and pupil responses.

Officers and instructors trained in SFST or DRE will increase their understanding of HGN. Prosecutors, Judges and Probation Officers will also benefit from the information regarding HGN.

If you need further information contact the State Coordinator.


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