What Is a DUI?

DUI (driving under the influence) — also called DWI (driving while intoxicated) in some states — is a serious criminal offense with significant consequences.

Legal limits:

0.08% BAC — The legal limit for drivers 21 and older in all 50 states.

0.04% BAC — The limit for commercial drivers.

Zero tolerance — Most states have zero or near-zero tolerance (0.00-0.02%) for drivers under 21.

Drug impairment — You can be charged with DUI for impairment by any drug, including prescription medications and marijuana (even where marijuana is legal).

Penalties for a first offense (typical):

Fines of $500-$5,000+

License suspension for 90 days to 1 year

Jail time of 0-6 months (varies widely)

Probation for 1-3 years

Mandatory alcohol education classes

Ignition interlock device (required in many states)

Increased insurance costs (SR-22 requirement)

Enhanced penalties apply for:

High BAC (often 0.15% or higher)

Prior DUI convictions

DUI with a child passenger

DUI causing injury or death

Refusal of chemical testing (implied consent penalties)

Implied consent. By driving on public roads, you have implicitly consented to chemical testing (breath, blood, urine). Refusing a test typically results in automatic license suspension and may be used as evidence against you.

Long-term consequences. A DUI stays on your criminal record permanently (in most states), affects employment prospects, can impact child custody, and dramatically increases insurance premiums.

This is legal information, not legal advice.