SFST TEST PRACTICE EXAM– QUESTIONS AND ANSWERS | VERIFIED AND WELL
DETAILED ANSWERS | EXAM TESTBANK | PLUS RATIONALES | DOWNLOAD
AND PASS | LATEST EXAM UPDATE 2026/2027
Core Domains
Standardized Field Sobriety Testing (SFST) Procedures
Drug Recognition Expert (DRE) Principles
Legal Standards and Case Law (e.g., Miranda, Probable Cause)
Human Physiology and the Effects of Alcohol and Other Drugs
NHTSA Guidelines and Protocols
Testimony and Courtroom Presentation
Report Writing and Documentation
Ethical Conduct and Professional Responsibility
Introduction
This comprehensive practice examination is designed to rigorously prepare
candidates for the SFST certification and recertification process. It assesses both
foundational knowledge and applied skills necessary for the accurate detection and
apprehension of impaired drivers. The exam utilizes a combination of multiple-
choice knowledge questions and complex scenario-based items to evaluate critical
thinking and decision-making in real-world enforcement contexts. Emphasis is
placed on understanding the scientific basis of the tests, the legal framework
governing their administration, and the professional standards required for effective
courtroom testimony. Mastery of this material is essential for ensuring public safety
and upholding the integrity of the justice system.
,SECTION ONE: QUESTIONS 1–50
1. The Horizontal Gaze Nystagmus (HGN) test is based on the principle that as
blood alcohol concentration increases, the angle of onset of nystagmus:
A. Remains constant at 45 degrees.
B. Increases beyond 45 degrees.
C. Decreases from 45 degrees toward the center.
D. Fluctuates randomly based on the individual's weight.
🟢 Correct Answer: C. Decreases from 45 degrees toward the center.
🔴 Explanation: The premise of the HGN test is that the angle of onset of
nystagmus decreases as BAC rises. A person with a BAC above .10 will typically
exhibit nystagmus at an angle of less than 45 degrees.
2. You are conducting a traffic stop on a vehicle that was weaving within its
lane. Upon approaching the driver, you detect a strong odor of an alcoholic
beverage. The driver's eyes are bloodshot and watery. Before administering
SFSTs, what is your primary legal consideration?
A. Ensuring your patrol vehicle is properly positioned.
B. Obtaining the driver's consent to search the vehicle.
C. Establishing probable cause or reasonable suspicion for the stop and continued
detention.
D. Advising the driver of their Miranda rights.
,🟢 Correct Answer: C. Establishing probable cause or reasonable suspicion for the
stop and continued detention.
🔴 Explanation: All SFST administrations must be predicated on a lawful stop and
reasonable suspicion that the driver is impaired. While other options are
considerations, the foundational legal requirement is the justification for the stop
and detention.
3. Which of the following best describes the 'equal tracking' requirement
during the HGN test?
A. Both eyes must show the same number of clues to indicate impairment.
B. The eyes must move together smoothly and symmetrically while following the
stimulus.
C. The stimulus must be held at the same distance from both eyes.
D. The officer must check each eye separately to ensure they track equally.
🟢 Correct Answer: B. The eyes must move together smoothly and symmetrically
while following the stimulus.
🔴 Explanation: 'Equal tracking' is a preliminary check to ensure both eyes can
smoothly and simultaneously follow the stimulus. If they cannot, there may be a
medical or neurological issue that invalidates the test.
4. In the Walk-and-Turn test, the subject is instructed to take nine heel-to-toe
steps, turn, and take nine heel-to-toe steps back. A subject starts the test
before the instructions are finished. This is scored as:
A. An instructional clue.
B. A starting too soon clue.
, C. A balance clue.
D. Not scored, as it is part of the instruction phase.
🟢 Correct Answer: B. A starting too soon clue.
🔴 Explanation: The NHTSA guidelines specifically list "Starts too soon" as one of
the eight validated clues. It is a failure to follow the instructions properly.
5. A driver fails the HGN, Walk-and-Turn, and One-Leg Stand tests. According
to NHTSA research, this combination indicates a BAC above .10 with what
approximate level of accuracy?
A. 65%
B. 77%
C. 88%
D. 91%
🟢 Correct Answer: D. 91%
🔴 Explanation: NHTSA validated studies show that when a subject exhibits clues
on all three tests, the probability of a BAC of .10 or higher is approximately 91%.
6. During the Divided Attention test phase, a subject performs well on the
physical tasks but makes errors on the instructional component. This suggests
impairment is most likely:
A. Primarily physical.
B. Primarily cognitive.
C. Not present.
D. Due to a medical condition.
DETAILED ANSWERS | EXAM TESTBANK | PLUS RATIONALES | DOWNLOAD
AND PASS | LATEST EXAM UPDATE 2026/2027
Core Domains
Standardized Field Sobriety Testing (SFST) Procedures
Drug Recognition Expert (DRE) Principles
Legal Standards and Case Law (e.g., Miranda, Probable Cause)
Human Physiology and the Effects of Alcohol and Other Drugs
NHTSA Guidelines and Protocols
Testimony and Courtroom Presentation
Report Writing and Documentation
Ethical Conduct and Professional Responsibility
Introduction
This comprehensive practice examination is designed to rigorously prepare
candidates for the SFST certification and recertification process. It assesses both
foundational knowledge and applied skills necessary for the accurate detection and
apprehension of impaired drivers. The exam utilizes a combination of multiple-
choice knowledge questions and complex scenario-based items to evaluate critical
thinking and decision-making in real-world enforcement contexts. Emphasis is
placed on understanding the scientific basis of the tests, the legal framework
governing their administration, and the professional standards required for effective
courtroom testimony. Mastery of this material is essential for ensuring public safety
and upholding the integrity of the justice system.
,SECTION ONE: QUESTIONS 1–50
1. The Horizontal Gaze Nystagmus (HGN) test is based on the principle that as
blood alcohol concentration increases, the angle of onset of nystagmus:
A. Remains constant at 45 degrees.
B. Increases beyond 45 degrees.
C. Decreases from 45 degrees toward the center.
D. Fluctuates randomly based on the individual's weight.
🟢 Correct Answer: C. Decreases from 45 degrees toward the center.
🔴 Explanation: The premise of the HGN test is that the angle of onset of
nystagmus decreases as BAC rises. A person with a BAC above .10 will typically
exhibit nystagmus at an angle of less than 45 degrees.
2. You are conducting a traffic stop on a vehicle that was weaving within its
lane. Upon approaching the driver, you detect a strong odor of an alcoholic
beverage. The driver's eyes are bloodshot and watery. Before administering
SFSTs, what is your primary legal consideration?
A. Ensuring your patrol vehicle is properly positioned.
B. Obtaining the driver's consent to search the vehicle.
C. Establishing probable cause or reasonable suspicion for the stop and continued
detention.
D. Advising the driver of their Miranda rights.
,🟢 Correct Answer: C. Establishing probable cause or reasonable suspicion for the
stop and continued detention.
🔴 Explanation: All SFST administrations must be predicated on a lawful stop and
reasonable suspicion that the driver is impaired. While other options are
considerations, the foundational legal requirement is the justification for the stop
and detention.
3. Which of the following best describes the 'equal tracking' requirement
during the HGN test?
A. Both eyes must show the same number of clues to indicate impairment.
B. The eyes must move together smoothly and symmetrically while following the
stimulus.
C. The stimulus must be held at the same distance from both eyes.
D. The officer must check each eye separately to ensure they track equally.
🟢 Correct Answer: B. The eyes must move together smoothly and symmetrically
while following the stimulus.
🔴 Explanation: 'Equal tracking' is a preliminary check to ensure both eyes can
smoothly and simultaneously follow the stimulus. If they cannot, there may be a
medical or neurological issue that invalidates the test.
4. In the Walk-and-Turn test, the subject is instructed to take nine heel-to-toe
steps, turn, and take nine heel-to-toe steps back. A subject starts the test
before the instructions are finished. This is scored as:
A. An instructional clue.
B. A starting too soon clue.
, C. A balance clue.
D. Not scored, as it is part of the instruction phase.
🟢 Correct Answer: B. A starting too soon clue.
🔴 Explanation: The NHTSA guidelines specifically list "Starts too soon" as one of
the eight validated clues. It is a failure to follow the instructions properly.
5. A driver fails the HGN, Walk-and-Turn, and One-Leg Stand tests. According
to NHTSA research, this combination indicates a BAC above .10 with what
approximate level of accuracy?
A. 65%
B. 77%
C. 88%
D. 91%
🟢 Correct Answer: D. 91%
🔴 Explanation: NHTSA validated studies show that when a subject exhibits clues
on all three tests, the probability of a BAC of .10 or higher is approximately 91%.
6. During the Divided Attention test phase, a subject performs well on the
physical tasks but makes errors on the instructional component. This suggests
impairment is most likely:
A. Primarily physical.
B. Primarily cognitive.
C. Not present.
D. Due to a medical condition.
