New York DMV Permit Written TestAlcohol and Drug LawsMedium
A police officer observes a driver swerving erratically and suspects impairment. After pulling the driver over, the officer asks them to perform a series of field sobriety tests. What is the primary purpose of these tests?
- ATo determine the driver's exact Blood Alcohol Content (BAC).
- BTo legally compel the driver to take a chemical test.
- CTo issue an immediate citation for reckless driving.
- DTo gather evidence of physical and mental impairment.
Show answer & explanationAnswer & explanation
Correct answer: D. To gather evidence of physical and mental impairment.
Field sobriety tests (FSTs) are designed to assess a driver's physical coordination, balance, and mental processing, which are all impaired by alcohol or drugs. They help the officer determine if there is probable cause for an arrest and a subsequent chemical test, but they do not directly measure BAC.
Why the other options are wrong
- A. FSTs are not designed to measure exact BAC; chemical tests do that.
- B. FSTs provide probable cause for a chemical test, but do not directly compel it; implied consent laws do.
- C. FSTs are an investigative tool, not a means to issue an immediate citation for a specific offense.
Field Sobriety Tests (FSTs)
Field Sobriety Tests are a series of standardized physical and mental exercises administered by law enforcement to assess a driver's impairment due to alcohol or drugs, and to establish probable cause for arrest.
- Used to detect impairment, not BAC.
- Assess coordination, balance, and mental processing.
- Provide probable cause for arrest and chemical testing.
- Common tests include HGN, Walk-and-Turn, One-Leg Stand.
Memory trick: FSTs find facts for further steps.