Rule 702(a1) was enacted in 2006 (effective for hearings held August 21, 2006 or later) to render admissible two types of expert testimony on the issue of impairment: (1) testimony regarding the results of a Horizontal Gaze Nystagmus (HGN) test; and (2) testimony from a certified Drug Recognition Expert (DRE) regarding whether a person is ... Read more
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