Chapter 4: DUI / DWI Laws

Driving under the influence of alcohol or drugs is one of the most dangerous and reckless decisions a person can make, leading to thousands of preventable deaths and injuries each year. Connecticut enforces extremely strict laws with severe, life-altering consequences to combat this behavior. Understanding these laws is not just about passing an exam; it is about recognizing the immense responsibility that comes with a driver’s license and making choices that protect your life and the lives of everyone on the road.

DUI & Implied Consent

In Connecticut, a driver can be charged with Driving Under the Influence (DUI), also known as Operating Under the Influence (OUI), for operating a motor vehicle while their ability to drive is impaired by alcohol, drugs, or a combination of both. This includes illegal narcotics, prescription medications, and over-the-counter drugs if they affect a driver’s judgment, coordination, or reaction time.

Blood Alcohol Concentration (BAC) Limits

While a driver can be convicted of DUI based on a police officer’s observation of impairment, the law also establishes specific Blood Alcohol Concentration (BAC) levels at which a driver is legally considered intoxicated. This is known as a “per se” DUI.

• Drivers 21 and Older: It is illegal to drive with a BAC of 0.08% or higher.
• Drivers Under 21 (“Zero Tolerance”): It is illegal for anyone under the age of 21 to drive with a BAC of 0.02% or higher. This low threshold means that even one alcoholic beverage can put a young driver over the legal limit.
• Commercial Drivers (CDL Holders): It is illegal to operate a commercial vehicle with a BAC of 0.04% or higher.