The Standardized Field Sobriety Test (SFST) is a battery of three basic test administered and evaluated in a standardized manner to obtain validated indicators of impairment and establish probable case for arrest. These tests were developed as a result of research sponsored by the National Highway Traffic Safety Administration (NHTSA). The three tests of the SFST are:

• The horizontal gaze nystagmus (HGN)
• The walk-and-turn
• The one-leg stand

These tests are administered systemtically and are evaluated according to measured responses of the suspect.

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