How many possible clues may be observed during HGN?
A total of six clues can be found during the administration of the HGN testing (3 clues for each eye). The test is designed to start with the person’s left eye being examined for any of the three cues. Afterwards, the the right aeye is examined. The first clue officers will look for is lack of smooth pursuit.
How many clues do you need to fail HGN?
There 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.
How many clues are there in Sfsts?
6
The clues are checked for in both eyes of the subject, meaning a total of (6) clues are possible to see during the HGN. Based on validation studies and research officers are trained on, if an officer observes 4 or more clues, it indicates that the person’s blood alcohol concentration (BAC) is 0.08 grams or higher.
What should I look for in HGN test?
Under the HGN test, jerking of the eyes should become considerably noticeable when a person is impaired. Furthermore, as a person’s blood alcohol concentration increases, the eyes should begin to jerk sooner as they move to the side.
How many clues are in walk and Turn Sfst?
2. Walk and Turn (WAT); (8 total clues, 2 in instruction phase, 6 in walking phase).
How many clues does it take to fail one leg stand?
In the One Leg Stand test there are four possible clues of impairment. If the suspect exhibits two clues then the test results indicate that the person is impaired.
What does HGN look for?
The Horizontal Nystagmus Test (HGN) is a standardized field sobriety test (FST) that police often administer in order to gauge whether a DUI suspect is under the influence of alcohol. The officer instructs the suspect to follow (with his eyes) a stimulus to the left and to the right.