How do you do Sfst?
This test measures the suspect’s ability to maintain their balance, walk in a straight line, and follow directions. To perform the test, the suspect will take nine heel-to-toe steps along a straight line during which time they must keep their arms to their side and count each step out loud.
What are the 8 clues in the walk and turn test?
The eight clues the officer will be looking for are: not keeping your balance while listening to instructions, starting the test before you are instructed to begin, not touching your heel to your toe, stepping off the line, stopping while walking, using your arms for balance, making an improper tum, and taking more or …
How long is Nhtsa Sfst training?
This course is a 16 hour classroom course which includes instruction on: NHTSA Studies. General Deterrence.
How accurate is Sfst?
Using the SFSTs, the officers were extremely accurate in discriminating between BACs above and below 0.08 percent. Estimates at the 0.08 level were accurate in 91 percent of the cases, or as high as 94 percent if explanations for some of the false positives are accepted.
How do you use HGN Sfst?
To administer the test, the officer will hold a small object approximately 12-15 inches from your nose and slowly move it from one side to the other. You will follow the object with your eyes while keeping your head still. The officer will look for three different clues in each (for a total of six) during the test.
What are the different sobriety tests?
There are different types of field sobriety tests that can be placed in four general categories: balance tests, coordination tests, mental agility tests, and eye tests. Perhaps the most common fall under the balance tests, which are: the walk-and-turn, the walk the line, one-leg stand, and the “Romberg” balance test.
How many clues does it take to fail walk and turn?
There are eight clues associated with the walk and turn test. Two can be assessed in the “instructional stage” (starts too soon, looses balance) and the remaining six in the” walking stage” (misses heel to toe, steps off line, uses arms to balance, stops while walking, too many steps, improper turn).
How long should the HGN test take?
In the following test one eye is look at a time. After the medical assessment is completed then the officer moves on to the HGN tests to evaluate impairment. IMPORTANT: The HGN Test should take approximately 88 seconds. If done too fast the test may have been improperly done.
What is the HGN test?
The horizontal gaze nystagmus (HGN) test is one of the most common field sobriety tests in use today. Supposedly, it’s a “standardized” method of helping police officers determine when a suspect may have been drinking.
Which field sobriety test is most accurate?
They found that standardizing the tests gave the horizontal gaze nystagmus a 77% accuracy rate, the walk and turn a 68% accuracy rate and the one-leg stand a 65% accuracy rate—and when all three were used together, they were correct 82% of the time.
How accurate is the walk and turn test?
According to government studies, the walk and turn test is 68% accurate in determining whether a driver has a blood alcohol concentration above . 10. Hence, nearly one out of three people who fail the test are not drunk driving.
What are the 3 clues for the HGN test?
There are a total of three clues that can be assessed in this test: lack of smooth pursuit, distinct nystagmus at maximum deviation, and the onset of nystagmus prior to 45 degrees.