Why You Might Fail Even When Stone-Cold Sober
Texas DWI Defense Attorney
When a police officer asks you to step out of your vehicle to perform a series of “gymnastics” on the side of a busy highway, they aren’t just checking your coordination. They are looking for “clues” to build a case against you. In Texas, these are known as Standardized Field Sobriety Tests (SFSTs).
At Beltz Law Group, we remind our clients that these tests were developed in controlled laboratory settings. In the real world—with headlights flashing, eighteen-wheelers roaring by, and uneven pavement—even a world-class athlete could struggle to pass.
The Big Three: What They Are and How They Fail
1. Horizontal Gaze Nystagmus (HGN)
The officer moves a stimulus (like a pen or light) in front of your eyes to look for “involuntary jerking.”
- The Flaw: Over 40 different medical conditions can cause nystagmus, including inner ear infections, caffeine consumption, and even simple fatigue.
- Environmental Error: “Optokinetic Nystagmus” can occur if the officer performs the test while his patrol lights are flashing in your face. Your eyes may jerk just trying to process the strobing light.
2. The Walk-and-Turn (WAT)
You are asked to walk nine steps heel-to-toe, turn, and walk back.
- Physical Limitations: This test is extremely difficult for anyone over the age of 65, individuals with back, knee, or ankle injuries, or those who are more than 50 pounds overweight.
- The Apparel Factor: Try walking heel-to-toe in high heels, heavy work boots, or flip-flops. The officer is supposed to give you the option to remove your shoes, but they often “forget.”
3. The One-Leg Stand (OLS)
You must balance on one leg while counting for 30 seconds.
- The Surface Problem: Most roadside shoulders are not flat; they are sloped for drainage or covered in gravel. Attempting to balance on a slant is a recipe for a “false failure.”
- External Distractions: Wind gusts from passing cars can easily knock a sober person off balance.
The Subjectivity of Scoring
DWI Attorney North Texas
Field sobriety tests are not graded on a curve. They are graded by an officer who has likely already decided you are intoxicated.
- The “Simon Says” Effect: If you start the test one second before the officer says “begin,” it is marked as a “clue” of intoxication.
- Subjective Clues: Did you “sway”? How much swaying is too much? The officer’s interpretation of your movement is often biased by the fact that they are looking for reasons to arrest you.
Why You Can (and Often Should) Refuse
Unlike breath and blood tests, you are not legally required to perform field sobriety tests in Texas. There is no license suspension for saying “No, thank you” to the roadside exercises. By refusing, you prevent the officer from gathering subjective evidence that a prosecutor will later use to paint you as “falling down drunk” in front of a jury.
How We Fight Back
At Beltz Law Group, we don’t just take the officer’s word for it. We:
- Analyze Body Cam Footage: We look for improper instructions or demonstrations.
- Highlight Environmental Factors: We document the weather, the road incline, and the traffic conditions.
- Use Medical Evidence: We present your medical records to show that a “missed step” was due to a chronic knee injury, not a third beer.
Did you struggle with the roadside tests? The “clues” the officer saw might have a perfectly legal explanation. Let us help you show the court that “unsteady” doesn’t mean “intoxicated.”
