Field Evaluation Study of the Standardized Field Sobriety Test (SFST) Battery (1995) This study is commonly referred to as the Colorado study and was a field study only. •Maximum number of clues is six. The fact is that Field Sobriety Tests are not 100% accurate. To illustrate the potential difficulties of passing a field sobriety test, three people at a shopping center were asked to perform the test while sober. You also hear rumors about things like officers asking people to recite the alphabet backward, but this doesn’t really happen. Those tests are If you're stopped by a law enforcement officer who believes that you're intoxicated or impaired, they may ask you to take field sobriety tests. c) the One-Legged Stand by itself was 65% accurate. Only three clues can appear in each eye. I've changed the labels to make the thing easier to read; you can get the original at Pdfs . •Deemed the most reliable field sobriety test. The typical “walk-and-turn” methods have a 68% accuracy rate. You should contest it! It is possible that you have a 0.00% blood alcohol level and still fail the FST. But are such tests scientifically accurate? The answer to this problem, for decades now, has been to use field sobriety tests. The accuracy of a field sobriety test depends in large part on how carefully the arresting officer administers the test. The one-leg-stand method has a 65% accuracy rate. The 3 tests that make up the SFST are the horizontal gaze nystagmus (HGN), the walk-and-turn, and the one-leg stand tests. It is crucial to your case to determine if the officer made any mistakes when administering a field sobriety test. If officers use all three tests together, the average accuracy is just 82%. The horizontal gaze nystagmus test has been shown to be 77 percent accurate, the walk-and-turn test 68 percent accurate and the one-leg stand accurate only 65 percent of the time. A field sobriety test is a series of physical tasks and actions that a person will need to perform if they are suspected of driving under the influence. DWI Detection and Standardized Field Sobriety Test (SFST) Participant Manual REFRESHER PDF, 24.96 MB ; PowerPoints: Main Training 19 individual PowerPoints (ZIP format) Other Material 2 sets of PowerPoints — 4 refresher sessions, and 5 optional sessions (ZIP format) 2017. b) the Walk-and-Turn by itself was 68% accurate. In this bog, we walk you through the many flaws that field sobriety tests have. Here's a Field Sobriety Test accuracy table from NHTSA's original "scientific" FST validation project, Psychophysical Tests for DWI Arrest 1977. What should you do if this happens? The most common three that they use are the horizontal gaze nystagmus test, the walk and turn test and the one-leg stand test. FIELD SOBRIETY TESTING. The prosecution claims that field sobriety tests are accurate 77% of the time on average. You can challenge the reliability of all three of these FSTs in court, and since they have only an 81-91% reliability rating, you could win. NHTSA analyzed the Laboratory and field-testing test data of sobriety tests and determined that: a) the HGN by itself was 77% accurate. Field sobriety tests (“FSTs“) are a series of physical and mental exercises that police administer in DUI investigations.Poor performance on FSTs is thought to be a sign of impairment from alcohol or drugs.As a result, law enforcement relies on them a great deal in deciding whether to arrest someone. The Standardized Field Sobriety Test (SFST) is a battery of 3 tests performed during a traffic stop in order to determine if a driver is impaired by alcohol or drugs. •HGN test always begins with subject’s LEFT eye . 6. The BAC level involved in this study was 0.100 grams, but it was not considered a false positive unless the BAC was below 0.050 grams. How Accurate Are Field Sobriety Tests? Call Today. 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