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Video tutorial: Mastering the nhtsa sfst pocket card

hi Im constable John McLeod a peace officer for 19 years today Im going to be showing you some tools used by police officers to detect impaired drivers or to determine whether that impairment is by drugs or alcohol one of those tools is the standardized field sobriety testing its used when police officers suspect the driver is impaired by drugs and/or alcohol the standardized field sobriety tests consist of a three test battery the first being the horizontal gaze nystagmus test then the walk in turn and then the one leg stand allow me to demonstrate the horizontal gaze nystagmus test please stamp their heels and toes together hands by your side dont do anything until I tell you to do you understand yes do you wear glasses or contacts yes thats fine you wont need them for this particular test Im gonna check your eyes okay I want you to follow the top of my pen stimulus here with just your eyes dont move your head do you understand they continue to watch the top of the pen thats

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Horizontal Gaze Nystagmus occurs as the eyes move to the side. It is the observation of the eyes for Horizontal Gaze Nystagmus that provides the first and most accurate test in the Standardized Field Sobriety Test battery.
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.
There are four cues or clues that a police officer is looking for on the One-Leg Stand Test. Failing 2 will lead to arrest.
Unusual behavior includes throwing something from the vehicle, drinking in the vehi- cle, urinating at the roadside, arguing with anoth- er motorist, or otherwise being disorderly. If you observe inappropriate or unusual behavior, there is a good probability that the driver is DWI.
Perhaps the biggest flaw in the horizontal gaze nystagmus test is that nystagmus is not caused solely by toxicity in the blood. You can be absolutely sober and still fail this test if you have any number of other existing health conditions including infections, syndromes, and even eyestrain.

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Horizontal Gaze Nystagmus: (4) or more clues is 88% reliable at indicating a person is 0.08 grams or higher.
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 persons blood alcohol concentration (BAC) is 0.08 grams or higher.
They say that when the (3) field sobriety tests are combined, they are 91% reliable in determining that a person is 0.08 grams or more.
This means it believes that 88% of the time the HGN will accurately determine whether a driver has a BAC of . 08% or higher. In the horizontal gaze nystagmus (HGN) field sobriety test for DUI, California law enforcement officers look for involuntary jerking of the eyes.
The Standardized Field Sobriety Testing (SFST) training curriculum collectively prepares police officers and other qualified persons to conduct the SFSTs for use in DWI investigations.

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