This description of the One Leg Stand test posted by Virginia DUI Lawyer.

• The current manual advises that this test must be performed on a reasonably level and smooth surface. There should be adequate lighting for the suspect to have a visual frame of reference. Conditions must be such that the suspect is in no danger if he or she were to fall. Certain wind/weather conditions obviously may interfere with and affect the validity of this test. This test should not be given to persons who are more than sixty five years of age, more than fifty pounds overweight, or with physical impairments that interfere with balance. Persons with injuries to their legs and inner ear disorders may have difficulty with this test. Individuals wearing heels more than two inches high should be given the opportunity to remove their shoes. It is imperative that the officer observe the suspect from at least three feet away, and remain as motionless as possible while the suspect is performing this test, so as not to interfere with the test

• The officer must demonstrate this. The suspect should be told not to start the test until told to do so and acknowledge that they understand the instructions. This acknowledgement should be documented. There are no scoring factors involved until the suspect is into the next stage: the Balance and Counting Stage, unless the suspect cannot perform the test at all. In this case, the suspect would be given a maximum score of four points. This would necessitate explanation on the part of the officer. It cannot be scored simply when the suspect refuses to perform the test.