Connecticut OUI Laws Explained

Connecticut calls the offense OUI — Operating Under the Influence — under CGS § 14-227a. The statute covers operating any motor vehicle on any public highway, parking area, school property, or even a private road open to the public, while under the influence of alcohol or drugs. Connecticut is procedurally distinct from most states because the criminal court process and the administrative DMV suspension run in tightly coordinated parallel — both are typically resolved through the same Suspended Imposition of Sentence path.

The legal threshold

Connecticut's per-se OUI thresholds:

• Adults 21+: 0.08% BAC.
• Drivers under 21: 0.02% BAC (zero-tolerance).
• Commercial drivers (CDL): 0.04% BAC.
• Enhanced penalty band: 0.16% BAC or higher.

Connecticut also charges OUI on impairment evidence below the per-se threshold, when officer observations, field sobriety tests, or drug recognition expert evaluations support a finding of impairment.

Administrative suspension and the IID

After an arrest where the BAC was 0.08% or higher (or the driver refused chemical testing), the arresting officer immediately reports the failure or refusal to the CT DMV. The DMV imposes a 45-day administrative suspension on the driver's license, followed by mandatory installation of an ignition interlock device (IID) for at least 1 year on a first-offense BAC violation. The IID requirement extends to 2 years for a second offense and 3 years for a third or subsequent.

The administrative hearing

Connecticut drivers can request an administrative hearing with the DMV's Hearings Branch within 7 days of receiving the suspension notice. The hearing addresses three narrow questions: did the officer have probable cause for the stop, did the driver refuse or fail the chemical test, and was the test administered properly. A favorable ruling prevents the administrative suspension; an unfavorable one allows it to take effect on day 45 from arrest.

First-offense criminal penalties

A first-offense OUI in Connecticut typically produces:

• Up to 6 months in jail (the first 48 hours mandatory; the remaining time often suspended on a typical first offense).
• $500-$1,000 in base fines, plus court costs and program fees.
• A 45-day criminal license suspension (overlapping with the administrative suspension).
• 1-year mandatory ignition interlock device.
• Mandatory completion of the Connecticut Alcohol and Drug Education Program (10 sessions over 10-15 weeks).
• SR-22 financial responsibility filing for 3 years — see CT insurance.
• Probation lasting 12-18 months in most courts.
• Community service hours (often 100 hours for a first offense).

Enhanced penalties at 0.16% BAC

A measured BAC of 0.16% or higher (twice the per-se limit) carries enhanced sentencing:

• Mandatory minimum 120-hour jail term, suspended only if community service is performed.
• Higher fine schedule.
• Extended IID period.
• Mandatory enhanced education program rather than the standard.

Repeat offenses

A second OUI within 10 years is automatically charged with mandatory minimum jail time of 120 days and a 1-year license suspension, plus 2 years of IID and an extended SR-22 period. A third OUI within 10 years is a felony — up to 3 years in state prison, mandatory minimum 1 year, permanent driver's license revocation (after which reapplication is possible only after 2 years and only with substantial conditions).

Refusal to take a chemical test

Connecticut's implied-consent law presumes that any driver who operates a motor vehicle on Connecticut roads has consented to a chemical test if reasonably suspected of OUI. Refusing the test triggers an automatic 45-day suspension on the first refusal, longer for subsequent refusals. The refusal is admissible against the driver at trial and typically does not prevent the underlying OUI charge from proceeding.

Drug-related OUI

Connecticut OUI also covers operation under the influence of any drug — illegal, prescription, or recreational marijuana. There's no per-se threshold for drugs equivalent to the 0.08% alcohol limit; impairment is established through Drug Recognition Expert evaluations, officer observations, and chemical tests of blood or urine. Connecticut's recreational marijuana legalization did not change the OUI law — driving under the influence of marijuana remains a CGS § 14-227a offense.

For reinstatement after an OUI conviction, see CT suspended license. To pull the official record showing the conviction, see CT driving records.