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DUI Defense Resource

Sobriety Tests

What the standardized field sobriety tests are and how lawyers challenge them.

Field sobriety tests (FSTs)

Standardized tests include the Horizontal Gaze Nystagmus, Walk‑and‑Turn, and One‑Leg Stand. Health issues, footwear, weather, and instructions can affect results. Officers must administer tests per training.

Defense angles

  • Non‑standard tests or poor instructions
  • Medical or balance conditions
  • Uneven or unsuitable surface
  • Improper scoring or missing video

Even if you performed poorly, chemical evidence must still be reliable and lawfully obtained.

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Disclaimer: Laws differ by state and change over time. Always consult a licensed attorney in your jurisdiction.