DUI Laws in Connecticut

This article provides a comprehensive overview of DUI laws in Connecticut, including definitions, penalties, legal processes, and resources for further information.

Driving Under the Influence (DUI) is a serious offense in Connecticut, carrying significant legal consequences. This article provides a comprehensive overview of DUI laws in Connecticut, including definitions, penalties, legal processes, and resources for further information. The goal is to enhance understanding and improve access to justice for those affected by DUI laws in the state.

Definition of DUI in Connecticut

In Connecticut, DUI is defined under Connecticut General Statutes (CGS) § 14-227a. A person is considered to be driving under the influence if they operate a motor vehicle:

  1. With an elevated blood alcohol content (BAC) of 0.08% or higher.
  2. While under the influence of alcohol, drugs, or both, to an extent that impairs their ability to drive.

Blood Alcohol Content (BAC) Limits

The legal BAC limits in Connecticut are as follows:

  • 0.08% for drivers aged 21 and over.
  • 0.04% for commercial drivers.
  • 0.02% for drivers under the age of 21.

These limits are strictly enforced, and exceeding them can result in DUI charges.

Penalties for DUI Offenses

First Offense

A first-time DUI offense in Connecticut carries the following penalties:

  • License Suspension: 45 days.
  • Ignition Interlock Device (IID): Required for one year.
  • Fines: Between $500 and $1,000.
  • Imprisonment: Up to six months, with a mandatory minimum of 48 hours or a suspended sentence with 100 hours of community service.

Second Offense

A second DUI offense within ten years of the first offense results in more severe penalties:

  • License Suspension: 45 days.
  • IID: Required for three years.
  • Fines: Between $1,000 and $4,000.
  • Imprisonment: Up to two years, with a mandatory minimum of 120 days and 100 hours of community service.

Third and Subsequent Offenses

A third or subsequent DUI offense within ten years of the previous offenses leads to the harshest penalties:

  • License Revocation: Permanent, with the possibility of reinstatement after two years.
  • IID: Required for as long as the license is reinstated.
  • Fines: Between $2,000 and $8,000.
  • Imprisonment: Up to three years, with a mandatory minimum of one year and 100 hours of community service.

Arrest and Booking

When a driver is suspected of DUI, they are typically subjected to field sobriety tests and a breathalyzer test. If the officer determines probable cause, the driver is arrested and taken to the police station for booking.


The arraignment is the first court appearance, where the defendant is formally charged and enters a plea. This is also when bail conditions are set.

Pre-Trial Hearings

Pre-trial hearings involve negotiations between the defense and prosecution. The defense may file motions to suppress evidence or dismiss charges.


If the case goes to trial, both sides present evidence and witnesses. The prosecution must prove beyond a reasonable doubt that the defendant was driving under the influence.


If found guilty, the judge will impose a sentence based on the severity of the offense and the defendant's criminal history.

Administrative Penalties

Administrative Per Se Law

Connecticut's Administrative Per Se law allows for immediate license suspension if a driver fails or refuses a chemical test. The suspension periods are:

  • 90 days for a first offense.
  • Nine months for a second offense.
  • Two years for a third or subsequent offense.

Ignition Interlock Device (IID) Program

The IID program requires convicted DUI offenders to install an IID in their vehicles. The device prevents the vehicle from starting if it detects alcohol on the driver's breath.

DUI and Commercial Drivers

Lower BAC Limit

Commercial drivers in Connecticut are held to a stricter BAC limit of 0.04%. Violating this limit can result in disqualification from operating commercial vehicles.


Commercial drivers face the same penalties as non-commercial drivers, with the added consequence of losing their commercial driver's license (CDL) for one year for a first offense and permanently for a second offense.

DUI and Underage Drivers

Zero Tolerance Law

Connecticut enforces a zero-tolerance law for drivers under the age of 21. A BAC of 0.02% or higher results in DUI charges.


Underage drivers face similar penalties to adult drivers, with additional consequences such as mandatory participation in alcohol education programs.

DUI and Drugs


Driving under the influence of drugs (DUID) is treated similarly to alcohol-related DUIs. This includes both illegal drugs and prescription medications that impair driving ability.


Officers may use field sobriety tests and drug recognition experts (DREs) to determine impairment. Chemical tests, such as blood or urine tests, are also used to detect the presence of drugs.


Penalties for DUID are the same as for alcohol-related DUIs, including fines, imprisonment, and license suspension.

Challenging the Stop

One common defense is to challenge the legality of the traffic stop. If the officer lacked reasonable suspicion to stop the vehicle, any evidence obtained may be inadmissible.

Questioning the Accuracy of Tests

Defendants may challenge the accuracy of field sobriety tests, breathalyzer tests, or chemical tests. Factors such as improper calibration or administration can be used to dispute the results.

Medical Conditions

Certain medical conditions can mimic signs of intoxication. For example, diabetes or neurological disorders may cause symptoms similar to impairment.

Rising BAC Defense

The rising BAC defense argues that the defendant's BAC was below the legal limit while driving but increased by the time the test was administered.

Resources and Support

Connecticut Department of Motor Vehicles (DMV)

The Connecticut DMV provides information on license suspension, IID requirements, and reinstatement procedures. Visit their website at Connecticut DMV - DUI.

Connecticut General Assembly

The Connecticut General Assembly's website offers access to state statutes, including DUI laws. Visit CGS § 14-227a for more information.

Several organizations and law firms specialize in DUI defense. They provide legal representation and advice for those facing DUI charges.

Alcohol Education Programs

Connecticut offers alcohol education programs for DUI offenders. These programs aim to reduce recidivism and promote responsible behavior.


Understanding DUI laws in Connecticut is crucial for drivers to avoid severe legal consequences. This article has provided a detailed overview of the definitions, penalties, legal processes, and resources related to DUI offenses in the state. By adhering to these laws and seeking appropriate legal assistance when needed, individuals can navigate the complexities of DUI charges more effectively.

For more information, visit official resources such as the Connecticut DMV and the Connecticut General Assembly.

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