WebJan 25, 2024 · It is true that if you have 100 people and 88 are clearly intoxicated and an officer has at least 4 clues on those 88 subjects alongside an additional 12 people who are objectively sober, then NHTSA can claim an 88% accuracy of the test but it is still bad science based on the data set. WebThis pamphlet instructs police in conducting the three most reliable field sobriety tests: the horizontal-gaze-nystagmus (HGN) test, the walk-and-turn test, and the one-leg-stand test. Abstract Tests sponsored by the National Highway Traffic Safety Administration revealed that the HGN test is most reliable (77 percent), followed by the walk-and ...
4 out of 6 HGN - HADA-LAW.COM
WebJan 3, 2024 · How many validated clues have been established for the HGN test? Horizontal Gaze Nystagmus Evaluation There are six cuesor clues that a police officer is looking for on the Horizontal Gaze Nystagmus Test, they are as follows: Lack of smooth pursuit. Distinct and sustained nystagmus and maximum deviation. Onset of nystagmus prior to 45 degrees. WebThere are six possible clues that an officer can claim indicate impairment on the HGN test. (Three clues per eye) It only takes two clues out of the six possible to “fail” the HGN test. Observations that are not clues that officers sometimes score by mistake. Failure to maintain balance while taking the test. sphcl
Horizontal Gaze Nystagmus - How It Works/How To Challenge and …
WebJun 14, 2024 · On voir dire, the officer testified that the HGN test was administered in accordance with NHTSA standards, those standards were derived from a scientific study, … WebJan 10, 2024 · Horizontal Gaze Nystagmus: (4) or more clues occurred in 37% of the people under 0.08 grams. Walk and Turn: (2) or more clues occurred in 52% of the people under 0.08 grams. One Leg Stand: (2) or more clues occurred in 41% of the people under 0.08 grams. Where do the high percentages of reliability that NHTSA reports come from? WebOct 16, 2024 · The maximum number of clues that may appear in one eye is three. The maximum total number for any suspect is six. The original research shows that if four or … sphc-pl