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Breaking Down Field Sobriety Test Inaccuracies and Flaws

Behind the Breathalyzer Case Studies and Courtroom Insights Legal Maneuvers Roadside Realities June 4, 2025
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Field sobriety tests like the Horizontal Gaze Nystagmus Test, Walk-and-Turn Test and One-Legged Stand Test have several flaws that may be exploited to challenge their credibility. A knowledgeable criminal defense attorney may call upon expert witnesses to highlight inaccuracies or flaws in these field tests that undermine them.

Environment factors, including uneven surfaces and inadequate lighting, can significantly impede test results. Furthermore, medical issues and physical impairments such as vertigo or balance issues may hinder performance during tests.

1. The Walk-and-Turn Test

Police officers administering field sobriety tests require suspects to walk heel-to-toe along a straight line during the second of three standardized field sobriety tests, known as divided attention tests, which require them to listen and follow directions while simultaneously performing physical tasks.

Officers are instructed to observe eight clues during the test that indicate intoxication, such as difficulty balancing while listening to instructions, beginning before they’ve been asked, failing to touch both heels to the toes of each foot, stopping to regain balance, using arms for support or taking more than nine steps either way. If two or more clues appear together it should indicate intoxication.

Problematically, these tests are highly inaccurate. Any number of variables could impede performance – poor weather conditions, existing health or mental conditions, even the anxiety you might be feeling during a DUI stop can all have a devastating impact.

2. The One-Legged Stand Test

This test requires an individual to stand on one foot for 30 seconds while counting aloud. If they sway from side-to-side or use their arms for balance, hop, or put down their foot before time expires, police will consider them to have failed the test and may arrest them for DUI.

While this test does provide some indication of impairment, its reliability cannot be relied upon as claimed by the National Highway Traffic Safety Administration. Medical conditions, environmental influences, improper footwear choices or distractions could all impact an individual’s ability to complete such an arduous task successfully.

Police training notwithstanding, even trained officers can make mistakes during field sobriety tests. Dashcam and body camera footage may reveal discrepancies with how officers administered field sobriety tests – this information could be used by criminal defense attorneys to challenge their accuracy in court. In addition, medical records and testimony from healthcare providers could demonstrate how certain medications or physical restrictions could cause similar signs as intoxication.

3. The Horizontal Gaze Nystagmus Test

Horizontal gaze nystagmus testing is an often-utilized field sobriety evaluation. An officer will shine a flashlight into each eye and monitor any jerking movements of your eyes; this test supposedly serves to detect intoxication; however it could also be affected by fatigue, medication or certain foods.

Well-trained officers rely heavily on three standard field sobriety tests: HGN, walk and turn and one leg stand tests when making arrest decisions; however, an experienced DUI defense lawyer can use any inaccuracies in these tests against the government’s evidence and overthrow it.

Police officers conduct these tests so frequently that they may make errors, such as providing wrong instructions, moving too rapidly or recording from an incorrect angle. This can give your defense team enough cause for doubt to win your case – contact us now so we can start discussing it together!

4. The Finger-to-Nose Test

Many individuals do not comprehend the three standardized field sobriety tests (SFSTs) used by police officers to screen suspected DUI-DWI drivers. Furthermore, many do not realize that these SFSTs have an error rate as high as 40-60 percent and this could result in unlawful arrests for DUI-DWI.

An Atlanta DUI lawyer experienced in FST challenges can analyze numerous factors to challenge its results, such as whether or not an officer followed clear instructions and administered it according to NHTSA standards, as well as considering any environmental or medical conditions which impede performance on these tests.

Real scientists tend to discount any reports of accuracy from field sobriety tests conducted outside a controlled laboratory environment, including Burns’ 1981 and earlier studies conducted without such conditions. Critics criticized these earlier, uncontrolled studies for using outdated and unreliable tests while they may also contain flaws that compromise accuracy in some way.

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