The one-leg stand test is a divided-attention test requiring the use of both your physical and mental faculties. Similar to the walk-and-turn test, the one-leg stand test has two stages: the instruction stage, and the balance and counting stage.
The instruction stage divides your attention between balancing and processing the instructions. The balance and counting stage divides your attention between balance and small muscle control.
An officer will instruct you on this test and then demonstrate a portion of the test for you. Tip: When an officer demonstrates this test, they will only demonstrate it for several seconds; you will have to perform the test for 30 seconds as instructed. The instructions are as follows.
Instructions for the One-Leg Stand
Instruction stage:
Balancing and counting stage:
Just as the test must be administered by the police in the same way every time, it must also be interpreted in a standardized manner. The interpretation of your performance on this test is determined by the presence of four different clues:
If you exhibit any of these four clues, the officer will mark it as a sign of intoxication. Generally, exhibiting the same clue multiple times will still only count as one clue. If you score two or more of the clues, an officer will say that you have lost the normal use of your mental and/or physical faculties. However, if you put your foot down three or more times or cannot perform the test, the one-leg stand will be terminated for inability to complete the test.
It will be important in fighting your DWI charge that you are represented by a criminal defense attorney who knows this test better than your arresting officer. It is important to tell the officer at the scene anything that might make it difficult for you to perform the test: age, weight, physical limitations, etc.
There are thousands of pages of results of decades' worth of research discussing the validity of these SFSTs. There are hundreds of experts who will testify both for and against their accuracy. However, the most important person to have on your side is your criminal defense attorney. A good criminal defense attorney will fight the admissibility and viability of these tests. In order to do so, you will need an attorney who knows these tests better than your arresting officer.
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