If a law enforcement official suspects that a driver is under the influence of alcohol, that officer may stop the person's vehicle to investigate the situation. In Oregon, a police officer may ask a suspected drunk driver to perform one or more field sobriety tests to demonstrate the driver's level of sobriety. One common test that drivers are asked to perform is the single leg stand, also sometimes called the one-leg stand.
During this test, a person is asked to exit his vehicle and to lift one of his feet off of the ground. He is asked to hold the foot at a certain level for a period of time. If the person leans, wobbles, puts his foot down, uses his arms for balance, or shows any other signs that he is unable to maintain his stance, the test may be used as evidence of his intoxication and may serve as a basis for the individual's drunk driving arrest.