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How Does The One-Leg Stand Test Prove Intoxication?

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Often, individuals facing DWI charges have been asked to perform the one-leg stand test. This test, one of several field sobriety tests administered by law enforcement, is used to identify impairment by assessing a person’s balance and coordination.

If you want to learn more about the one-leg stand test, its history, why it’s considered an indicator of intoxication, and how charges stemming from this test may be challenged, make an appointment with a seasoned Houston DWI lawyer.

Why Balance Tests Are Indicators of Impairment

The one-leg stand test, along with the walk-and-turn and horizontal gaze nystagmus tests, are part of the standardized field sobriety test battery developed by the National Highway Traffic Safety Administration (NHTSA) in the 1970s. These tests were designed to provide a systematic approach for officers to detect signs of intoxication.

Involving a person standing on one leg and holding the other foot about six inches off the ground, individuals taking the one-leg stand test typically hold the pose and count aloud for 30 seconds. Officers are trained to observe if the person sways, uses their arms for balance, hops, or puts their foot down, as these can be signs of impairment according to NHTSA guidelines.

Because alcohol and drugs can impair muscle coordination, reaction time, and focus, balance can illustrate impairment. For people under the influence, keeping steady without losing balance while standing on one leg can be difficult due to the effects on their motor skills and central nervous system. But while the test may be useful, it isn’t foolproof. Fatigue, uneven pavement, weather conditions, and nervousness can play a role in an individual’s ability to balance.

Fighting Charges Based on the One-Leg Stand Test

The results of field sobriety tests like the one-leg stand can be challenged, in some situations.

  • Test conditions. The environment where the test was conducted can make a difference in a person’s ability to perform. Sloped or gravel surfaces, poorly lit areas, or inclement weather can all affect balance, making it hard for anyone to perform well.
  • Health factors. Many individuals have legitimate physical or medical reasons that might impact their performance on the test. Conditions such as inner ear issues, leg injuries, or balance disorders could cause someone to sway or lose balance.
  • Officer conduct. Proper training and adherence to standardized test procedures are critical. If the officer failed to give clear instructions or did not properly observe or document the test, it may raise questions about the results.
  • Additional evidence. The one-leg stand test is rarely used in isolation. Breathalyzer results, witness statements, and dashboard camera footage play a role, too. If inconsistencies arise, it could cast doubt on an intoxication claim.

When facing a DWI charge based on a field sobriety test like the one-leg stand, don’t assume a failed test means a conviction. A skilled Houston DWI lawyer can examine all aspects of the case and build a strong defense.

Should you talk to a lawyer after you were asked to perform field sobriety tests? The legal team at Ayson Law Firm is available to protect your rights. Contact us today for a free consultation.

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