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DUI Field Sobriety Tests

If you happen to find yourself being subjected to a roadside field sobriety test based on suspicion of being under the influence of alcohol or drugs, there are some things about these tests you need to understand. First, the tests generally fall into two categories. There are:

  • Standard field sobriety tests (SFST): These tests have actually been subjected to some degree of scientific testing and have been found to be somewhat valid.

  • Non-standard field sobriety tests (NSFST): These are usually referred to as Field Sobriety Techniques as most have not been subjected to any scientific testing. Nonetheless, their results are generally admissible in Georgia Courts. As such, you should know of/about them.

Standard field sobriety tests
SFSTs consist of three evaluations developed by the National Highway Traffic Safety Administration (NHTSA). The three tests are:

  • Horizontal gaze nystagmus (HGN)

  • Walk and turn

  • One-leg stand

Horizontal gaze nystagmus is an involuntary jerking of the eyes. This involuntary jerking occurs naturally as the eyes move to the side. This test is usually conducted by moving an object (pen or finger) side to side in front of a person's face, and asking them to follow it with their eyes. The head must remain stationary. The officer looks for three indicators during the evaluation:

  1. Lack of smooth pursuit (jerking of the eye while following the object)

  2. Distinct and sustained nystagmus at maximum deviation (when the object is way out to the sides of the person’s face, the eyes continue “bouncing” from the corner of the eye opening)

  3. The angle at which jerking starts is within 45-degrees of center

The officer will score the suspect on a 0-6 scale for the number of clues he/she observes. The officer should always observe an even number of clues. In other words, nystagmus is symmetrical. Should 1 eye show a “clue’ on lack of smooth pursuit, the other eye should as well.

The officer is trained to believe that observing 4 or more clues is an indication that the suspect’s blood alcohol level is .10 or higher.

Walk and turn
The walk-and-turn test is conducted by having a person take nine heel-to-toe steps, along a straight line, followed by a turn on one foot and nine steps back in the same direction toward the suspect’s original starting point. The examiner looks for eight “clues” of impairment. The officer will make note of whether or not the suspect:

  1. Cannot keep balance while listening to instructions

  2. Begins before instructions are finished

  3. Stops while walking to regain balance

  4. Does not touch heel-to-toe

  5. Steps off the line

  6. Uses arms to keep balance (raised more than 6” from the sides)

  7. Makes an improper turn

  8. Takes an incorrect number of steps

The officer will score a suspect on a 0-8 scale based on the number of clues he/she observes. The officer is trained to believe that 2 or more clues suggests that the suspect’s blood alcohol is .10 or higher.

The biggest problem most suspects face, with this test, is that the test involves lengthy instructions. Even a stone sober suspect SHOULD request that the officer repeat, both, the instructions and his/her demonstration of the exam. Most suspects are too nervous to make such a request.

The One-leg stand
The one-leg stand test is conducted by having the suspect stand with one foot approximately six inches off the ground and count aloud to a specific number, or until told to stop. The examiner looks for four indicators of impairment:

  1. Swaying while balancing

  2. Using arms to balance (raised more than 6” from the sides)

  3. Hopping to maintain balance

  4. Putting the foot down.

The officer should allow the suspect to hold the foot off the ground for 30 seconds.

The officer will score a suspect on a 0-4 scale based on the number of clues he/she observes. The officer is trained to believe that 2 or more clues suggests that a suspect’s blood alcohol is .10 or higher. They are told this is true 65% of the time.

Non-standardized field tests
NSFSTs are classified as any other mental or coordination test an officer may give to a subject in an effort to determine impairment. These commonly include:

  • Rhomberg Balance Test: this requires the driver to stand, feet together, and lean the head back to look up at the sky while holding their arms out to the side. The officer is simply looking for a loss of balance. This test is not taught in Georgia as part of Standardized Field Sobriety Training.

  • Finger-To-Nose Test: this requires the driver might to close his or her eyes and bring the finger around to touch the nose. This test is not taught in Georgia as part of Standardized Field Sobriety Training.

  • Finger Count Test: requires driver to touch the tip of the thumb in turn to the tip of each finger on the same hand while simultaneously counting up (1, 2, 3, 4) and then to go backwards counting in reverse order (4, 3, 2, 1).

  • Hand Pat Test: the driver is asked to extend a hand in front, palm upwards. The other hand is then placed on top of the first hand, palm downwards. The driver then ‘pats’ the lower hand with the upper hand by rotating it, so that first the lower hand is patted with the palm of the upper hand and then with the back of the upper hand. This test is not taught in Georgia as part of Standardized Field Sobriety Training.

  • ABCs: the driver is asked to recite part of the alphabet. The officer instructs them to begin at a certain letter (other than “A”) and to stop at some letter (other than “Z”) and to avoid singing.

  • Numbers Backward Test: the driver must count backwards. Self-explanatory. This test is not taught in Georgia as part of Standardized Field Sobriety Training.

For more information on DUI law, visit my website at I can be reached at [email protected] or by phone at 770-729-4809.

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