Chapter 4: DUI / DWI Laws

Use this guide to prepare for the exam, and refer to the official manual for complete details.

Driving is a privilege that requires sound judgment and unimpaired physical and mental faculties. Operating a vehicle while under the influence of alcohol or drugs is a reckless decision that severely compromises a driver’s ability to perceive hazards and react safely, leading to thousands of preventable deaths and injuries each year. Understanding Georgia’s strict DUI laws is essential not only for passing the driver’s exam but for recognizing the severe legal and personal consequences of impaired driving.

In Georgia, it is illegal for any person to operate a motor vehicle while under the influence of alcohol, drugs, or any other intoxicating substance to the extent that it is less safe for the person to drive. This is a critical point: a DUI conviction does not require proof of drunkenness, only that the driver was impaired and less safe.

Defining DUI

A driver can be convicted of DUI in two primary ways:

  1. Per Se DUI: This is based on the driver’s Blood Alcohol Concentration (BAC) being at or above a specific legal limit. The driver is considered “per se” (by itself) under the influence, regardless of whether they appeared intoxicated.
  2. Less Safe DUI: This applies when a driver’s BAC is below the legal limit, or when drugs are involved. A conviction is based on evidence that the driver was impaired and therefore a less safe driver. This can be proven by erratic driving, poor performance on field sobriety tests, or the presence of any intoxicating substance. This includes prescription and over-the-counter medications if they impair driving ability.

Blood Alcohol Concentration (BAC) Limits

A chart compares four standard drinks—1.5 ounces of whiskey, 5 ounces of wine, 8–9 ounces of a cocktail, and 12 ounces of beer—indicating they are equivalent in alcohol content.
  • 21 or Older: It is illegal to drive with a BAC of 0.08% or higher.
  • Under 21: Georgia has a “zero tolerance” policy. It is illegal for a person under 21 to drive with a BAC of 0.02% or higher. This low threshold means even a single alcoholic beverage can result in a DUI arrest.
  • Commercial Drivers (CDL): It is illegal to operate a commercial vehicle with a BAC of 0.04% or higher.

Implied Consent Law

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