SFST Exam Questions and Correct
Answers| Latest Update| Score 100%
San Diego Percentages
San Diego FST validation—NHSTA accurate
a. HGN was 88%
b. WAT 79%
c. OLS 83%
3 tests for possible DUI
1) Horizontal Gaze Nystagmus (HGN)
2) One Leg Stand (OLS)
3) Walk and Turn (WAT)
Most reliable FST
Horizontal Gaze Nystagmus
, NHTSA 3 Phases
Phase 1: Vehicle in motion
- Stop the car?
Phase 2: Personal Contact
- SFST testing?
Phase Three: Pre-arrest Screening
- Arrest?
Common symptoms of alcohol influence
A. .03 slowed Reaction
B. .05 Impaired Judgement
C .08 Impaired vision
D. .10 Poor coordination
Horizontal Gaze Nystagmus (HGN)-Steps and Clues
3 clues per eye-IN ORDER (4 min)
1. Lack of smooth pursuit
2. Distinct and sustained nystagmus at maximum deviation
3. Onset of nystagmus prior to 45 degrees
Answers| Latest Update| Score 100%
San Diego Percentages
San Diego FST validation—NHSTA accurate
a. HGN was 88%
b. WAT 79%
c. OLS 83%
3 tests for possible DUI
1) Horizontal Gaze Nystagmus (HGN)
2) One Leg Stand (OLS)
3) Walk and Turn (WAT)
Most reliable FST
Horizontal Gaze Nystagmus
, NHTSA 3 Phases
Phase 1: Vehicle in motion
- Stop the car?
Phase 2: Personal Contact
- SFST testing?
Phase Three: Pre-arrest Screening
- Arrest?
Common symptoms of alcohol influence
A. .03 slowed Reaction
B. .05 Impaired Judgement
C .08 Impaired vision
D. .10 Poor coordination
Horizontal Gaze Nystagmus (HGN)-Steps and Clues
3 clues per eye-IN ORDER (4 min)
1. Lack of smooth pursuit
2. Distinct and sustained nystagmus at maximum deviation
3. Onset of nystagmus prior to 45 degrees
