Definition 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 the 3 tests that make up the sfst are the horizontal gaze nystagmus hgn the walk and turn and the one leg stand tests. Seated battery of standardized field sobriety testing the seated battery of standardize field sobriety testing sfst was developed to address a number of issues faced by marine patrol officers these issues involve having a suspect perform balance related tests after being on the water for all or part of the day as well as transporting . The field sobriety test is officially called the standardized field sobriety test battery it consists of three different tests each is supposed to be administered and graded by an impartial law enforcement officer. The fact of the matter is that standardized field sobriety tests results are subject to challenge by an experienced drunk driving owi dui lawyer i am proud to say that i have been nhtsa certified in the administration of sfsts having received the same training as law enforcement officials. Provides the first and most accurate test in the standardized field sobriety test battery vertical gaze nystagmus vgn is an involuntary jerking of the eyes up and down which occurs when the eyes gaze upward at maximum elevation
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