9.2 Impaired Driving (OUI/DUI) Detection & SFST Protocols (CGS 14-227a)

9.2 Impaired Driving (OUI/DUI) Detection & SFST Protocols (CGS 14-227a)

Impaired driving remains a leading cause of fatal traffic collisions across Connecticut. Connecticut General Statutes (CGS) § 14-227a defines the criminal offense of Operating Under the Influence (OUI), establishing both behavioral impairment standards and illegal per se blood alcohol limits. Connecticut law enforcement officers must strictly adhere to National Highway Traffic Safety Administration (NHTSA) detection protocols and Standardized Field Sobriety Test (SFST) administration guidelines to successfully identify, arrest, and prosecute impaired drivers.

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1. Connecticut OUI Statute (CGS § 14-227a) & Statutory Elements

To secure a conviction for Operating Under the Influence under CGS § 14-227a, the prosecution must establish four essential legal elements beyond a reasonable doubt:

1. Operation: The accused operated a motor vehicle. "Operation" extends beyond driving to include sitting behind the steering wheel with the engine running, or key in the ignition, exercising control over the vehicle's mechanism.
2. Motor Vehicle: The device operated meets the statutory definition of a motor vehicle under CGS § 14-1 (including automobiles, trucks, motorcycles, and ATVs).
3. Location: Operation occurred on a public highway, key private road, parking area for ten or more cars, or school property.
4. Impairment / Per Se Limit: The operator was under the influence of intoxicating liquor, any drug, or both, OR had an elevated Blood Alcohol Content (BAC) at the time of operation.

+-------------------------------------------------------------------+
|            CONNECTICUT PER SE BLOOD ALCOHOL CONTENT (BAC) LIMITS  |
+-------------------------------------------------------------------+
|  ADULT DRIVERS (Age 21+)              |  0.08% BAC or higher     |
|  UNDERAGE DRIVERS (Under 21)          |  0.02% BAC or higher     |
|  COMMERCIAL VEHICLE DRIVERS (CDL)     |  0.04% BAC or higher     |
+-------------------------------------------------------------------+

Statutory Per Se Limits & Drug Impairment

• Adult Per Se Standard (0.08% BAC): An adult driver (age 21 or older) operates per se illegally with a BAC of 0.08% (0.08 grams of alcohol per 100 mL of blood) or higher.
• Zero Tolerance / Under 21 Standard (0.02% BAC): Connecticut enforces a strict Zero Tolerance policy for underage drivers. Any driver under age 21 operating with a BAC of 0.02% or higher violates CGS § 14-227g / § 14-227a.
• Commercial Driver's License Standard (0.04% BAC): Under CGS § 14-227a(a)(2), a commercial motor vehicle driver operating a commercial vehicle with a BAC of 0.04% or higher commits OUI.
• Drug Impairment: CGS § 14-227a prohibits driving under the influence of cannabis, narcotic drugs, prescription medications, or hallucinogens. Unlike alcohol, drug OUI relies primarily on establishing behavioral impairment, observations by Drug Recognition Experts (DRE), and toxicology analysis of blood/urine.

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2. NHTSA 3-Phase OUI Detection Process

NHTSA establishes a systematic, three-phase detection process. At each phase, the officer must decide whether to proceed to the next phase or dismiss suspicion:

[ Phase 1: Vehicle in Motion ]  ---> Decision: Stop the Vehicle?
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[ Phase 2: Personal Contact ]   ---> Decision: Request Driver to Exit?
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[ Phase 3: Pre-Arrest Screening ] ---> Decision: Arrest for OUI?

Phase 1: Vehicle in Motion

The officer observes the suspect vehicle operating on the roadway. Visual cues of alcohol or drug impairment include:

• Weaving across lane lines or straddling centerlines
• Erratic speed changes (driving 10+ mph below speed limit, sudden braking)
• Turning with abnormally wide radius
• Stopping inappropriately (stopping far before or past an intersection line)
• Operating without headlights at night or delayed response to traffic signals

Phase 2: Personal Contact

The officer approaches the vehicle and interacts directly with the driver. The officer gathers sensory evidence:

• Sight: Bloodshot, watery, glassy eyes; soiled clothing; presence of alcohol containers, drug paraphernalia, or cannabis odor/smoke.
• Hearing: Slurred speech, thick-tongued pronunciation, abusive/uncooperative language, inconsistent or conflicting answers.
• Smell: Distinct odor of an alcoholic beverage on the driver's breath or body (note: alcohol itself is odorless; the odor stems from flavorings and fermentation byproducts).
• Divided Attention Capabilities: Requesting license and registration while asking a simple question (e.g., asking for year of birth) tests divided attention. Fumbling, handing over incorrect cards, or ignoring questions indicates impairment.

Phase 3: Pre-Arrest Screening

The officer requests the driver to exit the vehicle to conduct physical screening. This phase includes:

1. Observing exit behavior (unsteady balance, using vehicle for support, stumbling).
2. Administering the NHTSA Standardized Field Sobriety Test (SFST) battery.
3. Administering a Preliminary Breath Test (PBT) (where authorized/equipped) as a roadside screening tool.

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3. Standardized Field Sobriety Test (SFST) Battery

The NHTSA SFST battery consists of three scientifically validated, standardized tests administered under strict instructions on a flat, dry, non-slippery surface.

Horizontal Gaze Nystagmus (HGN)

HGN is the involuntary jerking of the eyes occurring as the eyes gaze toward the side. Alcohol and central nervous system depressants cause nystagmus to become pronounced and occur at earlier angles. Prior to testing, officers must check for medical qualifications: equal pupil size and equal tracking (to rule out neurological trauma/resting nystagmus).

The officer moves a stimulus (pen or small penlight) 12–15 inches from the suspect's nose and evaluates 3 clues per eye (6 clues total):

1. Lack of Smooth Pursuit: The eye jerks or bounces as it follows the moving stimulus rather than tracking smoothly.
2. Distinct and Sustained Nystagmus at Maximum Deviation: The eye is held at maximum lateral deviation for at least 4 seconds, displaying distinct, continuous jerking.
3. Onset of Nystagmus Prior to 45 Degrees: The eye begins jerking before reaching a 45-degree angle from center.

Walk and Turn (WAT)

The WAT is a two-stage divided attention test: Instruction Stage and Walking Stage. The officer instructs the suspect to take 9 heel-to-toe steps down a straight line, turn in a specific manner, and take 9 heel-to-toe steps back. The officer tracks 8 clues:

1. Cannot keep balance during instructions (feet break instruction stance).
2. Starts too soon (before instructions are complete).
3. Stops while walking to regain balance.
4. Misses heel-to-toe (gap greater than 1/2 inch).
5. Steps off the straight line.
6. Uses arms for balance (raising arms 6+ inches from sides).
7. Improper turn (pivots incorrectly or loses balance while turning).
8. Incorrect number of steps (takes more or less than 9 steps).

One-Leg Stand (OLS)

The OLS is a divided attention test requiring the suspect to stand on one leg (chosen by suspect), with the other foot raised approximately 6 inches off the ground, parallel to the ground, while counting aloud ("one thousand one, one thousand two...") until told to stop after 30 seconds. The officer tracks 4 clues:

1. Sways while balancing (side-to-side or back-and-forth motion).
2. Uses arms to balance (raising arms 6+ inches from sides).
3. Hops on the anchor foot to maintain balance.
4. Puts foot down before 30 seconds expires.

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4. Implied Consent & Chemical Testing (CGS § 14-227b)

Under Connecticut's Implied Consent Law (CGS § 14-227b), any person who operates a motor vehicle in Connecticut is deemed to have given consent to a chemical test of their breath, blood, or urine to determine BAC or drug presence following a lawful arrest for OUI.

Chemical Test Refusal & Consequences

If an arrested OUI driver refuses to submit to a chemical test after receiving statutory warnings (Form A-44 Implied Consent Advisory):

• Immediate Administrative Revocation: The officer revokes the driver's license on behalf of the DMV, issuing a 24-hour temporary license followed by mandatory administrative suspension.
• DMV Administrative Suspension: License suspension ranges from 45 days up to multi-year suspensions depending on prior OUI history, followed by mandatory installation of an Ignition Interlock Device (IID).
• Evidentiary Use in Court: Refusal to submit to a chemical test is fully admissible as evidence of consciousness of guilt in a criminal trial under CGS § 14-227a(e).