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FREQUENTLY ASKED QUESTIONS ABOUT DUI IN Baltimore
THE HORIZONTAL GAZE NYSTAGMUS TEST FOR DUI IN Baltimore The Horizontal Gaze Nystagmus is a test designed to measure the jerking of the eye. There are three ways to measure this "jerking" The first is to check for smooth pursuit. The next check is done to see whether the nystagmus becomes more "distinct" when the eye is moved to a lateral extreme or maximum deviation. The final measure is whether there is an onset of nystagmus before the 45 degrees. By measuring the angle at which the eye begins jerking, an officer can, theoretically, roughly estimate BAC.
What does all of this mean? We know when a police officer does not do the tests correctly. Oftentimes, if I am able to catch them, they will look foolish. Most juries can understand that field tests really do not mean all that they are set out to be. Most jurors cannot stand on one leg regardless of whether or not they have been drinking. Field sobriety tests can be handled in court with proper training and questioning. I believe that people who have been drinking will not perform well on these tests, but I also believe that most non-athletic people will not perform well either. The Horizontal Gaze Nystagmus is used by police and prosecutors as a scientific test. If it is done correctly, it has been shown to have validity. However, road conditions are different than laboratory conditions. An officer with traffic going by, blue lights flashing, and potential for danger does not always do the test as he was taught. Thus, if the test is not done properly, the validity is compromised.
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