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	The horizontal gaze nystagmus
	The walk-and-turn
	The one-leg stand.

Trezza & Thrush, your best resource for a Tucson DUI lawyer , wants you to be well informed. Here is a basic description of Standardized Field Sobriety Testing:

The Standardized Field Sobriety Test (SFST) is a battery of three tests administered and evaluated in a standardized manner to obtain validated indicators of impairment and establish probable cause for arrest. These tests were developed as a result of research sponsored by the National Highway Traffic Safety Administration (NHTSA) and conducted by the Southern California Research Institute. A formal program of training was developed and is available through NHTSA to help police officers become more skillful at detecting DWI suspects, describing the behavior of these suspects, and presenting effective testimony in court. Formal administration and accreditation of the program is provided through IACP. The three tests of the SFST are:

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

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