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Title	HORIZONTAL GAZE NYSTAGMUS: THE SCIENCE AND THE LAW - A RESOURCE GUIDE FOR JUDGES, PROSECUTORS AND LAW ENFORCEMENT
Accession No	00798222
Corp. Authors / Publisher	National Highway Traffic Safety Administration
Publication Date	19990700
Description	131 p.; Appendices(12); References
Languages	English
Abstract	Despite its history of use and the endorsement of the Department of Transportation's National Highway Traffic Safety Administration, the horizontal gaze nystagmus (HGN) field sobriety test is not fully understood. What is nystagmus? How does the presence of horizontal gaze nystagmus reflect alcohol impairment? How does the police officer test for HGN? What conclusions can reasonably be drawn from the presence of HGN? In an effort to provide accurate information regarding the use of the HGN test in impaired driving enforcement and dispel the continuing controversy around HGN, the American Prosecutors Research Institute (APRI) is pleased to provide criminal justice practitioners nationwide with this document. Among other things, this guide provides an overview of the science supporting the HGN test as a valid indicator of impairment, distinguishes between HGN and other forms of nystagmus, and provides the necessary tools to establish admissibility of the HGN in court.
TRT Terms	Alcohol tests ; Drunk drivers ; Eye movements ; Field tests ; Impaired drivers ; Jurisprudence and judicial processes ; Law ; Police ; Sobriety checkpoints ; Traffic law enforcement
Other Terms	Horizontal gaze nystagmus
Subject Areas	H70 LAW; I83 Accidents and the Human Factor
Report Number	HS-808 938
Availability	National Highway Traffic Safety Administration
URLs	Document: http://ntl.bts.gov/lib/25000/25900/25975/DOT-HS-808-938.pdf
Document Source	National Highway Traffic Safety Administration
TRIS Files	HRIS; HSL; NTL
Database	TRIS Online

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