APPENDIX A Note: This is prosecution oriented information written with a view towards law enforcement and justification of the HGN tests. Please be aware that HGN testing as a field sobriety test is fraught with problems, inaccuracies, false and voodoo science, and just plain misunderstanding in its administration and application. COMBINED TEST SCORING PROCEDURE [Post-publication note (August 1999): This matrix is no longer used in SFST training materials.] Horizontal Gaze Nystagmus Test Score
The above matrix utilizes the combined test scores for the horizontal gaze nystagmus test and the walk and turn test. If the box at the intersection of a subject’s horizontal gaze nystagmus and walk and turn test scores is shaded, a subject’s blood alcohol content is predicted to be .10%. Data showed that the accuracy of law enforcement officers correctly classifying subjects as above or below .10% blood alcohol content is 80% using this matrix.
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