DWI Detection and Standardized Field Sobriety Testing (SFST) Certification — Questions and Answers

Question 1: What is HIPAA?

A medical diagnosis code
A hospital ranking system
A type of insurance plan
Health Insurance Portability and Accountability Act — protects patient privacy (Correct answer)

Correct answer: Health Insurance Portability and Accountability Act — protects patient privacy

HIPAA establishes national standards for protecting patient health information, ensuring privacy and security of medical records.

Question 2: An officer conducting SFSTs on a military base without jurisdiction authorization may have the evidence:

Admitted with a limiting instruction
Treated as valid under federal supremacy
Transferred to a civilian court automatically
Suppressed for lack of legal authority to act (Correct answer)

Correct answer: Suppressed for lack of legal authority to act

Evidence obtained by an officer acting outside their jurisdiction may be suppressed because the stop lacked legal authority.

Question 3: Based on its effects on the central nervous system, alcohol is classified as which type of drug?

Depressant (Correct answer)
Stimulant
Hallucinogen
Narcotic

Correct answer: Depressant

Alcohol is a central nervous system depressant that slows brain function and neural activity, impairing judgment, coordination, and reaction time.

Question 4: The Walk and Turn test is classified by NHTSA as which category of divided-attention test?

Psychomotor only
Both psychomotor and cognitive simultaneously (Correct answer)
Cognitive only
Neither — it is a coordination test only

Correct answer: Both psychomotor and cognitive simultaneously

The WAT requires the suspect to simultaneously perform physical movements (psychomotor) and follow/count instructions (cognitive), making it a divided-attention test.

Question 5: Alcohol is distributed throughout the body primarily via body water because:

Alcohol is water-soluble and distributes through total body water (Correct answer)
Alcohol is stored in adipose (fat) tissue for slow release
Alcohol binds to hemoglobin in red blood cells
Alcohol is too large a molecule to enter fatty tissue

Correct answer: Alcohol is water-soluble and distributes through total body water

Alcohol is highly water-soluble and distributes evenly throughout the body's total water content, which is why body composition (water vs. fat percentage) affects BAC.

Question 6: Which cognitive skill is typically the first to be negatively affected by alcohol consumption?

Gross motor coordination
Divided attention (Correct answer)
Vision acuity
Long-term memory recall

Correct answer: Divided attention

Divided attention — the ability to perform two or more tasks simultaneously — is among the first cognitive skills impaired by alcohol, making it a key focus of SFSTs.

Question 7: When should you change an answer on a test?

Change every answer you doubt
Only when you have a clear reason the new answer is better (Correct answer)
Always change your first answer
Never change answers

Correct answer: Only when you have a clear reason the new answer is better

Research shows changing answers is beneficial only when you have a specific reason, such as recalling new information or catching a misread question.

Question 8: What is the process of elimination in multiple-choice testing?

Removing your first answer
Skipping every other question
Ruling out obviously incorrect answers to improve odds (Correct answer)
Eliminating questions you don't know

Correct answer: Ruling out obviously incorrect answers to improve odds

Process of elimination involves identifying and removing clearly wrong answers, increasing the probability of selecting the correct answer from remaining options.

Question 9: What does 'DRE' stand for in the context of drug-impaired driving investigation?

Driver Response Evaluation
Driving Risk Examiner
Drug Recognition Expert (Correct answer)
Diagnostic Roadside Evaluation

Correct answer: Drug Recognition Expert

Drug Recognition Experts are officers specially trained to identify drug impairment beyond alcohol, supplementing standard SFST protocols.

Question 10: What role does ethics play in One Leg Stand practice?

It guides professional conduct and protects stakeholders (Correct answer)
Ethics is optional in professional settings
It only matters for legal compliance
It only applies to managers

Correct answer: It guides professional conduct and protects stakeholders

Professional ethics provide frameworks for responsible decision-making, ensuring practitioners act in the best interest of those they serve.

Question 11: Why is continuing education important in Walk and Turn?

To stay current with evolving standards and practices (Correct answer)
Only for re-certification requirements
To network only
It is not important after certification

Correct answer: To stay current with evolving standards and practices

Continuing education keeps professionals updated with the latest developments, standards, and best practices in their field.

Question 12: Which of the following factors does NOT affect an individual's BAC level?

Body weight
Rate of consumption
Food in the stomach
Eye color (Correct answer)

Correct answer: Eye color

Eye color has no physiological relationship to how alcohol is absorbed or metabolized; BAC is influenced by weight, consumption rate, food, and gender.

Question 13: Which of the following is NOT one of the three NHTSA-validated standardized field sobriety tests?

One-Leg Stand
Finger-to-Nose (Correct answer)
Horizontal Gaze Nystagmus
Walk-and-Turn

Correct answer: Finger-to-Nose

The three NHTSA-validated SFSTs are HGN, Walk-and-Turn, and One-Leg Stand; Finger-to-Nose is not among the validated battery.

Question 14: Carbonated mixers (such as tonic water or cola) typically have what effect on alcohol absorption?

They significantly slow alcohol absorption
They reduce the peak BAC achieved
They speed up alcohol absorption into the bloodstream (Correct answer)
They have no measurable effect on absorption rate

Correct answer: They speed up alcohol absorption into the bloodstream

Carbonation increases gastric pressure and speeds gastric emptying, causing alcohol to enter the small intestine faster and resulting in more rapid absorption.

Question 15: What is the significance of documenting the subject's statement 'I only had two beers' in an SFST report?

It proves the subject is not impaired and should trigger test termination
It is inadmissible hearsay and should be omitted from the report
It is an admission that may be compared to SFST performance and BAC evidence (Correct answer)
It legally limits prosecution to only alcohol-related charges

Correct answer: It is an admission that may be compared to SFST performance and BAC evidence

The subject's self-reported alcohol consumption is a relevant admission that can be contrasted with observed clues and chemical test results during prosecution.

Question 16: What is the evidentiary value of documenting a subject's odor of alcohol as part of an SFST report?

It is a corroborating sensory observation that supports the officer's probable cause determination (Correct answer)
Odor of alcohol alone establishes a per se DUI violation and is legally sufficient for conviction
Odor documentation is prohibited because it is subjective and inadmissible
It is only relevant if the officer is certified as a drug recognition expert

Correct answer: It is a corroborating sensory observation that supports the officer's probable cause determination

The odor of alcohol is a relevant, corroborating observation that contributes to the totality of circumstances supporting the officer's probable cause determination.

Question 17: How many passes does the officer make for the Lack of Smooth Pursuit check (both eyes combined)?

Two passes (one per eye)
Four passes — two per eye
Two complete passes (left to right, then right to left) (Correct answer)
One pass (left to right only)

Correct answer: Two complete passes (left to right, then right to left)

NHTSA requires two complete passes — moving the stimulus from center to one side and back, repeated twice — so the officer checks smooth pursuit thoroughly in both eyes.

Question 18: An officer estimates that nystagmus onset occurs at exactly 45 degrees. Should this be scored as a clue?

No, because the clue requires onset PRIOR TO 45 degrees (Correct answer)
Yes, but only if observed in both eyes simultaneously
Yes, because it meets the 45-degree threshold
No, unless VGN is also present

Correct answer: No, because the clue requires onset PRIOR TO 45 degrees

The clue is 'Onset Prior to 45 Degrees' — onset exactly at 45 degrees does not meet the standard and should not be scored as a clue.

Question 19: Which of the following actions by a suspect during the Walk and Turn turn phase does NOT constitute the 'improper turn' clue?

Turning slowly using small steps around the front foot (Correct answer)
Using the rear foot as a pivot instead of the front foot
Stepping to the side before turning
Spinning on both feet

Correct answer: Turning slowly using small steps around the front foot

Turning slowly using small steps around the front foot is the correct technique and does not score as an improper turn clue.

Question 20: The forensic technique of 'retrograde extrapolation' refers to:

Projecting a driver's future BAC based on consumption rate
Determining the number of drinks consumed from witness statements
Calculating what a person's BAC was at an earlier time based on a later chemical test result (Correct answer)
Measuring BAC precisely at the moment of the traffic stop

Correct answer: Calculating what a person's BAC was at an earlier time based on a later chemical test result

Retrograde extrapolation uses elimination rate formulas to work backward from a known BAC (measured at testing) to estimate what BAC was at the time of driving.

Question 21: Why is reading the question carefully important?

It doesn't matter
To waste time
To memorize the question
To avoid misinterpreting what is being asked (Correct answer)

Correct answer: To avoid misinterpreting what is being asked

Many wrong answers result from misreading questions. Key words like 'NOT,' 'EXCEPT,' 'BEST,' or 'MOST' can completely change what's being asked.

Question 22: When documenting the preliminary breath test (PBT) result in relation to SFST performance, what must the officer clarify?

That the PBT result supports but does not replace the totality of SFST observations (Correct answer)
The PBT result alone is sufficient to establish probable cause without SFST documentation
PBT results must be documented before any SFST is administered
The PBT result is inadmissible and should never appear in the SFST report

Correct answer: That the PBT result supports but does not replace the totality of SFST observations

PBT results are a supplemental tool, and reports must reflect that probable cause is based on the totality of observations including SFSTs, not solely on the PBT reading.

Question 23: Women typically achieve higher BAC levels than men after consuming the same amount of alcohol primarily because women:

Have blood that carries alcohol less efficiently than male blood
Metabolize alcohol significantly more slowly in the liver
Generally have a higher percentage of body fat and a lower percentage of total body water (Correct answer)
Have a faster resting heart rate that circulates alcohol more rapidly

Correct answer: Generally have a higher percentage of body fat and a lower percentage of total body water

Women typically have a higher body fat percentage and lower body water percentage than men of the same weight, so the same amount of alcohol is distributed in a smaller volume of water, resulting in a higher BAC.

Question 24: A defense attorney challenges SFST evidence by arguing the officer lacked certification. What is the likely legal outcome?

The charges are automatically dismissed
The officer is personally liable for false arrest
The evidence is inadmissible in all circumstances
The court may reduce the weight of the evidence or allow it with proper foundation testimony (Correct answer)

Correct answer: The court may reduce the weight of the evidence or allow it with proper foundation testimony

Lack of formal certification affects credibility and foundation, but courts typically weigh rather than automatically suppress such evidence.

Question 25: In most U.S. states, the per se BAC limit for non-commercial adult drivers is:

0.05%
0.08% (Correct answer)
0.10%
0.06%

Correct answer: 0.08%

The federally encouraged and most widely adopted per se BAC limit for adult non-commercial drivers in the U.S. is 0.08%.

DWI Detection and Standardized Field Sobriety Testing (SFST) Certification

The NHTSA/IACP SFST certification exam tests law enforcement officers on DWI detection procedures, standardized field sobriety test administration (HGN, Walk-and-Turn, One-Leg-Stand), alcohol physiology, documentation, and courtroom testimony. A passing score of 80% is required for certification.

Questions

60 min

Time Limit

80%

To Pass

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These practice questions were written with AI tools. They are not real exam questions. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy

Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

nhtsa.gov — Retake policy, test delivery, passing score · verified Oct 2026
theiacp.org — Renewal · verified Oct 2026