DUI (Driving Under the Influence) and DWI (Driving While Intoxicated or Impaired) are criminal offenses that involve operating a motor vehicle while impaired by alcohol, drugs, or other intoxicating substances. The exact definitions and terms vary by state or country, but both refer to driving in an impaired state that endangers public safety.
DUI (Driving Under the Influence): Refers broadly to driving while impaired by alcohol or drugs (including prescription medications and marijuana).
DWI (Driving While Intoxicated/Impaired): Often used interchangeably with DUI but may refer specifically to alcohol intoxication in some jurisdictions, or be a more serious charge than DUI.
Some states use only one term, while others distinguish between the two.
Blood Alcohol Concentration (BAC):
0.08% or higher for most adult drivers (standard legal limit in the U.S.).
0.04% for commercial drivers.
0.00% to 0.02% for underage drivers (zero-tolerance laws).
Drug-related DUI/DWI can be charged even without a specific BAC, based on impairment observed by law enforcement or blood/urine tests.
Erratic driving or swerving
Slurred speech, red eyes, slow reaction
Failing a field sobriety test or breathalyzer test
First Offense (usually a misdemeanor):
Fines ($500–$2,000+)
Jail time (up to 6 months or more)
Driver’s license suspension (30 days to 1 year)
Probation and/or mandatory DUI education programs
Ignition interlock device (breath test to start car)
Repeat Offenses or Aggravated DUI:
Felony charges
Longer jail/prison time
Heavier fines
Longer license suspension or revocation
Vehicle impoundment or forfeiture
High BAC (e.g., 0.15% or more)
Causing injury or death
Driving with minors in the vehicle
Repeat offenses within a certain time frame
Â
Criminal record
Increased insurance rates
Employment and travel restrictions
Professional license impacts