Understanding Standardized Field Sobriety Tests (FSTs)
Field sobriety tests (FSTs) play a critical role in most DUI investigations. They are designed as roadside exercises to help officers decide if a motorist is impaired. But here's the truth: these tests are far from foolproof and can often be used to build a powerful defense in your case.
When you're stopped on suspicion of DUI, the officer's goal is to collect evidence against you. However, understanding how these tests work—and their many weaknesses—can turn the tables in your favor.
What Are Standardized Field Sobriety Tests?
Standardized Field Sobriety Tests, or FSTs, are physical and mental exercises that divide your attention between following instructions and performing specific tasks. The National Highway Traffic Safety Administration (NHTSA) endorses only three of these tests:
- Horizontal Gaze Nystagmus (HGN) – often called "the eye test."
- Walk-and-Turn (WAT) – a nine-step heel-to-toe walking exercise.
- One-Leg Stand (OLS) – balancing on one foot while counting.
These three tests form the core of any DUI investigation, but additional exercises—like reciting the alphabet or touching your nose—lack scientific validation and carry no official weight.
The Reality of Field Sobriety Testing
Field Sobriety Test's may look straightforward, but they are designed for failure. Even under perfect conditions, most sober people struggle to pass them. Now consider the typical roadside environment:
- Uneven or sloped pavement.
- Bright police lights.
- Heavy traffic whizzing by.
- The anxiety of being pulled over.
- Personal health and medical issues.
These factors make a fair evaluation nearly impossible. Officers then "grade" your performance based on subjective observations and predefined "clues," which are often inconsistent or applied incorrectly. This is where an experienced Pennsylvania DUI defense attorney like Mike Sherman can make all the difference.
Why Field Sobriety Tests Matter in Your Case
The primary purpose of these tests is to establish probable cause for a DUI arrest—not to prove guilt. Their reliability depends on strict adherence to NHTSA protocols. If an officer deviates from these guidelines, the results may be invalid, providing a critical avenue for your defense.
That's why Mike Sherman's certification in NHTSA Standardized Field Sobriety Testing is so important. Mike Sherman completed the same training as law enforcement officers, allowing him to scrutinize their methods and identify errors. Mike's experience as a former Pennsylvania State Police attorney gives him unique insight into how these tests are administered and challenged in court.
What's Next: Breaking Down the Three Tests
To help you understand each test, I've prepared detailed guides. The following pages are dedicated to breaking down the standardized tests used in DUI investigations:
- Horizontal Gaze Nystagmus (HGN) – How your eyes can betray—or defend—you. Find out how subtle eye movements are used in DUI cases.
- Walk-and-Turn – Why this balance exercise often stumbles in court. Discover why balance and coordination are key to this exercise.
- One-Leg Stand (OLS) – The challenges of a test few can perform perfectly. Learn what officers look for and common challenges to the test.
- Field Sobriety Testing Frequently Asked Questions (FAQs) – Answers to common questions about field sobriety tests and how they impact your defense.
Protect Yourself with Knowledge and Proven Expertise
Field sobriety tests are just one piece of the puzzle in a DUI case. Understanding their weaknesses and exposing law enforcement mistakes can mean the difference between conviction and dismissal. With my certification in NHTSA Standardized Field Sobriety Testing, my experience as a former Pennsylvania State Police attorney, and my dedication to uncovering every detail in your case, I have the tools to fight for the best possible outcome.
Don't leave your future to chance—put my unique experience and expertise to work for you. Call me today at (412) 471-5000 to schedule your free no obligation consultation. Together, we'll craft a defense strategy that protects your freedom, your rights, your license, and your livelihood.
