Alcohol Impairment HGN vs. Cannabis Impairment Abnormal Eye Movements (not HGN)

Video courtesy of retired Nahant (MA) PD Sgt. Don Decker and retired Columbus (OH) PD Sgt. Jim Rease.  Sgt. Decker is also the retired MA DEC Coordinator, Eastern Region, and retired from the International Association Chiefs of Police’s Technical Advisory Panel; Sgt. Rease continues to be a DRE instructor.