"The most commonly administered FSTs include:
- horizontal gaze nystagmus test, which involves following an object with the eyes (such as a pen) to determine characteristic eye movement reaction.
- walk-and-turn (heel-to-toe in a straight line). (This test is designed to measure a persons ability to follow directions and remember a series of steps while dividing attention between physical and mental tasks.)
- one-leg-stand.
- modified-position-of-attention (feet together, head back, eyes closed for thirty seconds; also known as the Romberg test).
- finger-to-nose (tip head back, eyes closed, touch the tip of nose with tip of index finger).
- recite all or part of the alphabet (a common myth is that the alphabet must be recited backwards, however, this is never done during an FST, as many sober people are unable to do this.).
touch each finger of hand to thumb counting with each touch (1, 2, 3, 4, 4, 3, 2, 1).
- count backwards from a number such as 30 or 100.
- breathe into a "portable or preliminary breath tester" or PBT"
Reference:
http://en.wikipedia.org/wiki/Drunk_driving_in_the_United_Sta...
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