[Ed. note - This is part V of a DUI Training series. This training article is on the Walk and Turn test. Prior articles covered Horizontal Gaze Nystagmus, Walk and Turn, Vehicle in Motion and Personal Contact.]

Photo courtesy of Jeffrey Smith
The One-Leg-Stand (OLS) test is the final validated test in the NHTSA approved battery of three sobriety tests. Like the other two tests, the OLS is a divided attention test, meaning the subject being tested must divide their attention on several different instructions to successfully complete the test.
Operating a motor vehicle safely requires the driver to divide their attention (multi-task) on a continuous basis. You should familiarize yourself with with this concept as it helps a judge or jury understand that these tests are not meant to “fail” the tested subject, but are meant to gauge their ability to perform multiple tasks at the same time – something a sober driver does all the time.
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[Ed. note - This is part IV of a DUI Training series. This training article is on the Walk and Turn test. Prior articles covered
[Ed. note - This is part III of a DUI Training series. This training article is on horizontal gaze nystagmus. Prior articles covered 



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