Field sobriety tests from time to time called roadside sobriety tests are used to implement DUI laws and typically precede breathalyzer tests. A police officer typically performs the three part field sobriety test after a traffic stop in which there is doubt that the motorist may be drunk or otherwise impaired. These tests allow an officer to observe a suspect's balance, physical ability, attention level or other factors that the officer may use to determine whether the suspect is driving under the influence. Officers record the suspect's presentation on a field sobriety test to be used as evidence in DUI cases such tests usually have been upheld on plea. The Standardized Field Sobriety Test (SFST) authorized by the National Highway Traffic and Safety Administration (NHTSA) consists of the horizontal gaze nystagmus (HGN), walk and-turn (WAT) and one leg stand (OLS).
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