Get the free The Robustness of the Horizontal Gaze Nystagmus Test

This technical report examines the validity and reliability of the Horizontal Gaze Nystagmus (HGN) test used by police officers in field sobriety tests, evaluating the impact of procedural variations

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How to fill out The Robustness of the Horizontal Gaze Nystagmus Test

1. Begin by ensuring a quiet environment free from distractions.
2. Position the subject comfortably, sitting or standing about 12-15 inches away.
3. Instruct the subject to keep their head still and focus on a target, such as a pen or your finger.
4. Slowly move the target horizontally from side to side, ensuring you observe the subject's eyes.
5. Look for signs of nystagmus, such as jerking motion of the eyes.
6. Note the angle at which nystagmus begins, typically at 30 degrees or less.
7. Repeat the test on both sides to ensure consistency.
8. Record all observations and findings systematically.

Who needs The Robustness of the Horizontal Gaze Nystagmus Test?

1. Law enforcement officers conducting field sobriety tests.
2. Medical professionals assessing vestibular function.
3. Alcohol and drug counselors evaluating individuals for substance use.
4. Researchers studying eye movement and its relation to impairment.

People Also Ask about

How many clues to fail SFST?

False positives are the number of people who were below 0.08% BAC but got arrested anyway. There was a 29% false positive rate in the report!

What are three clues that would show you someone is failing a horizontal gaze test?

This 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.

How reliable is the horizontal gaze nystagmus test?

ing to the government's own studies, the HGN Test is deemed to be only 77% accurate in determining whether you have a blood alcohol concentration above . 10. This essentially means that roughly one out of four people who fail the test are NOT intoxicated.

What does the horizontal gaze nystagmus test assess?

The HGN test actually comprises three separate assessments of independent eye movements: smooth pursuit, presence of nystagmus when looking as far as possible to either side, and presence of nystagmus when looking only part of the way to either side.

How accurate is the SFST?

Horizontal gaze nystagmus (HGN) is the involuntary jerking of one's eye when it gazes to the side. Alcohol use exaggerates this jerking motion. The HGN test is evidence of impairment in DUI cases.

What is the false positive rate for field sobriety test?

Your odds of “passing” all three of the standardized FSTs are relatively low for several reasons, including: The tests are completely subjective. The same officer who suspects that you are under the influence gets to decide if you passed the test that is supposed to indicate intoxication.

What is the most accurate field sobriety test?

Under certain circumstances, horizontal gaze nystagmus (HGN) sobriety tests can be considered "inadmissible" in court. ing to the NHTSA, HNG testing can allow prosecutors to establish scientific evidence against a DUI suspect in court. However, HGN testing isn't always accurate.

What is the most reliable field sobriety test?

Study to confirm the effectiveness of the standardized field sobriety test battery using a larger sample size. Concluded that the HGN test was the most effective of the three tests and that greater accuracy in determining whether a subject's BAC is over .

How often are field sobriety tests wrong?

There is considerable room for error regarding the reliability of the test results. Tests are only 81% to 91% accurate in determining if a person is intoxicated. That means up to 20% of the time, the results may be flawed.

How accurate is the horizontal gaze nystagmus test?

Horizontal Gaze Nystagmus There are six clues, or three in each eye: Lack of smooth pursuit. Distinct and sustained nystagmus at maximum deviation. Onset of nystagmus prior to 45-Degrees.

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What is The Robustness of the Horizontal Gaze Nystagmus Test?

The Robustness of the Horizontal Gaze Nystagmus Test refers to the reliability and validity of the test in assessing a person's level of impairment due to alcohol or drugs. It evaluates the involuntary eye movement known as nystagmus when the eyes are moved horizontally.

Who is required to file The Robustness of the Horizontal Gaze Nystagmus Test?

Law enforcement officers, particularly those trained in field sobriety testing, are required to administer and report the results of the Horizontal Gaze Nystagmus Test when suspected impairment is observed during a traffic stop.

How to fill out The Robustness of the Horizontal Gaze Nystagmus Test?

To fill out the test, an officer should document the observed behaviors and results during the test. This includes checking for three specific indicators of nystagmus in each eye and noting the angles at which nystagmus is observed, along with the subject's behavior and any other relevant observations.

What is the purpose of The Robustness of the Horizontal Gaze Nystagmus Test?

The purpose of the test is to assist law enforcement in determining whether a driver is impaired due to alcohol or substances. It provides objective indicators of impairment based on physiological responses.

What information must be reported on The Robustness of the Horizontal Gaze Nystagmus Test?

The information that must be reported includes the observed nystagmus (including onset angle and whether it occurs at 45 degrees), any additional observations of the subject's behavior, environmental conditions, the results of the test, and the officer's certifications or training related to the administration of the test.