Drunk and drugged driving laws in Kentucky

By the end of this topic you can

• You can state the legal alcohol limits for adults and for drivers under 21.
• You can explain how alcohol and drugs affect judgment, vision and reaction time.
• You can explain Kentucky's implied consent law and the effects of refusing a test.
• You can list the aggravating circumstances that bring tougher penalties.
• You can plan a safe way home that does not involve impaired driving.

What you need to know and understand

• It is illegal to drive or be in physical control of a vehicle with an alcohol concentration of 0.08 or more, or while under the influence of any substance that impairs driving.
• You can be charged below 0.08 if there is evidence your driving is impaired.
• Drivers under 21 break the law at an alcohol concentration of 0.02 or more.
• By driving in Kentucky you have given implied consent to lawfully requested chemical tests, such as a breath or blood test.
• Refusing a test can lead to license suspension. Since July 2026, a refused blood test can no longer be used in court as evidence of DUI, but a refused breath test still can.
• A first DUI within ten years can bring a fine of $200 to $500, jail of 48 hours to 30 days, and license suspension.

What alcohol and drugs do to a driver

Alcohol and impairing drugs weaken judgment, blur vision, make it harder to judge distance and speed, reduce color recognition and slow reactions. The manual notes that vision is already affected at 0.02. Impairment starts with the first drink.

Many prescription and over-the-counter medicines, such as sleep aids, sedatives, pain relievers and some allergy and cold remedies, can make you drowsy. Read the label and ask a pharmacist. Mixing any of these with alcohol multiplies the effect. Having a prescription or a medical cannabis card does not make it legal to drive while impaired.

Tests, refusals and your rights

If an officer suspects impairment, you may be asked for a breath or blood test. Before any test you get at least 10 and no more than 15 minutes to try to contact a lawyer. If you take the test, you may have your own blood test done by a qualified person at your own expense. Refusing can lead to license suspension. A 2026 change to the law (Senate Bill 66, in force from July 2026) means a refused blood test can no longer be used in court as evidence of DUI or count as an aggravating circumstance, while a refused breath test still can, provided the officer gave you the required warnings first.

Aggravating circumstances

Mandatory jail time applies to a DUI when any of these are present:

• Driving more than 30 mph over the posted speed limit.
• Driving the wrong way on a limited access highway.
• Causing a crash that results in death or serious physical injury.
• An alcohol concentration of 0.15 or higher within two hours of driving.
• Refusing a requested breath test (since July 2026, refusing a blood test no longer counts).
• Carrying a passenger under 12 years old.

After a conviction

Everyone convicted of DUI must be assessed and complete an approved alcohol education or treatment program before getting their license back. Courts may order an ignition interlock device, which stops the car starting if your breath alcohol is over 0.02. Drivers under 18 can face longer suspensions, and for permit and intermediate holders any DUI violation also delays the next licensing phase by at least 180 days.

Common mistakes

• Believing you are fine to drive after one or two drinks. The under-21 limit of 0.02 can be reached with very little alcohol.
• Driving after taking a medicine that warns of drowsiness.
• Thinking coffee or a cold shower sobers you up. Only time does.
• Getting in a car with a driver who has been drinking or using drugs.

Test yourself: Drunk and drugged driving laws in Kentucky

Answer each question, then read the explanation. Questions come in a random order each time.

Go deeper

• Kentucky 60 Hour Practice Driving Log
• Kentucky Bioptic Driving Program
• Kentucky Drivers Ed for Teens