3 Facts about the Accuracy of Field Sobriety Tests

A DWI charge is a serious offense that could dramatically impact the course of your life. Aside from legal penalties such as fines and jail time, a drunk driving conviction on your record could severely curtail your success in the professional world as well as destroy your personal reputation. Therefore, it is important to discuss your defense options with a knowledgeable attorney if you have been accused of driving while intoxicated.

At the Law Offices of Mark T. Lassiter, we believe that a wrongful DWI charge is unacceptable. If you have been mistakenly accused of DWI and need experienced, aggressive legal defense, contact a Dallas criminal attorney from our offices at 214-845-7007 today.

Three Standardized Field Sobriety Tests

The National Highway Traffic Safety Administration has approved three tests for the evaluation of whether a person is driving while intoxicated. Considering the potentially devastating consequences of a DWI conviction, these standardized field sobriety tests should be exact, yet they are much less accurate than one would expect.

Three standardized field sobriety tests and their accuracy levels are:

  1. Horizontal Gaze Nystagmus – this test uses eye movement to determine an individual’s level of intoxication, and is only 77% accurate.
  2. Walk and Turn – in this test, a driver is asked to take nine heel-to-toe steps in a straight line back and forth. It is 68% accurate.
  3. One Leg Stand – this test requires a person to stand for 30 seconds with one leg 6 inches from the ground. It is just 65% accurate.

These percentages were obtained from carefully controlled testing. Unfortunately, in real situations, nerves, medical conditions, and improper test administration could all contribute to a sober individual’s inability to pass such assessments.

Contact Us

If you are facing a false DWI charge, a Dallas criminal lawyer of the Law Offices of Mark T. Lassiter may be able to help you clear your name. Contact us at 214-845-7007 for a free consultation to learn more about what you can do to obtain the justice you deserve.


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