What Are Field Sobriety Tests?
Field sobriety tests are roadside exercises officers use to gauge potential impairment, not to measure actual intoxication. They include tasks such as the walk-and-turn, one-leg stand, and horizontal gaze nystagmus test. These tests are subjective, and officers rely on interpretation rather than measurable scientific evidence. A failed test does not prove guilt, and it can be challenged in court.
Field sobriety tests are commonly used during traffic stops across Metro Detroit, but they are influenced by nerves, physical limitations, uneven pavement, weather, footwear, and officer judgment. Understanding how these tests work can help you challenge inaccurate or unfair results.
Are Field Sobriety Tests Mandatory in Michigan?
Field sobriety tests are voluntary in Michigan. Drivers are not legally required to perform them, and refusing does not trigger automatic penalties. While Michigan’s implied consent law applies to chemical tests, it does not apply to roadside exercises. Officers often fail to explain this clearly, leading many drivers to believe they must comply.
Refusing an FST does not guarantee that you will avoid arrest, but it limits the amount of subjective evidence available to prosecutors later on.
What Happens If You Refuse a Field Sobriety Test?
Refusing a field sobriety test does not carry immediate legal penalties, but you may still be arrested if the officer believes other observations justify probable cause. Without FST results, the prosecution depends heavily on the officer’s testimony, which can often be challenged.
In many cases, declining the test reduces the evidence available against you and forces the court to examine whether probable cause truly existed for the arrest.
Conditions That Can Cause You to Fail Field Sobriety Tests
Many drivers fail field sobriety tests for reasons unrelated to alcohol. These factors can undermine the testing process and become powerful arguments in your defense. Some of the most common include:
- Back, knee, ankle, or balance issues
- Inner ear disorders or vertigo
- Fatigue or anxiety during the stop
- Poor lighting or uneven pavement
- Cold, snow, rain, or wind
- Footwear such as boots, dress shoes, sandals, or heels
- Age or physical limitations
- Confusing or unclear officer instructions
Common Mistakes Officers Make During Field Sobriety Tests
Police officers must follow standardized procedures, and deviations can invalidate results. Dashcam and bodycam footage often reveal mistakes that can weaken the prosecution’s case. Common errors include:
- Failing to provide clear instructions
- Not demonstrating the task correctly
- Conducting tests on uneven or unsafe ground
- Ignoring medical or physical limitations
- Rushing through instructions or scoring
- Using non-standard tests
- Displaying bias or pre-judgment
- Inconsistent observations between the written reports and the video
Can Poor Field Sobriety Test Performance Be Thrown Out?
Yes. If the officer misapplied testing procedures, ignored physical limitations, or used unsafe testing conditions, your attorney can file a motion to suppress the results. In many cases, excluding FST evidence leads to reduced charges or alternative outcomes that protect your record.
How a Lawyer Can Help You Fight Field Sobriety Test Charges
A defense attorney can evaluate whether the testing process was flawed and whether your rights were respected. Without legal representation, you may not know which parts of the case are weak or how to challenge subjective officer testimony. Legal guidance helps you understand your options and work toward the best possible outcome.
Contact Our Michigan Field Sobriety Test Defense Lawyers
Failing a field sobriety test does not mean you are guilty of DUI. These tests are subjective, often unreliable, and affected by factors outside your control. Jeffrey Randa and Associates helps drivers throughout Metro Detroit, including Oakland, Wayne, and Macomb County, challenge improper testing, flawed procedures, and weak evidence. Contact our office today to schedule your consultation.