In most cases, if an officer has probable cause to believe that you are driving under the influence, "implied consent laws" require you to take a chemical test (using your blood, breath, or urine) to determine your blood alcohol content ( BAC). The standardized FSTs are called the "horizontal gaze nystagmus test," "one-leg-stand test," and "walk-and-turn test." As a general rule (and unlike with chemical testing), there is no legal penalty for refusing to take an FST. Studies have been done that purportedly showed these standardized tests are reliable for gauging intoxication. There are three " standardized FSTs" that police often administer during DUI investigations. Generally, police use FSTs to get a better idea of whether a driver is under the influence of drugs or alcohol. DUI testing generally falls into one of two categories: field sobriety tests (FSTs) and chemical testing. When police suspect someone of drunk driving, they will normally ask the person to perfect certain tests.
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