"Zero Tolerance" Blood Alcohol Concentration (BAC) Level
All states carry "zero tolerance" laws that target drivers under the legal drinking age. These laws penalize persons under 21 for operating a vehicle with any trace of alcohol in their systems (a BAC above 0.0), or with negligible BAC levels such as .01 or .02 percent.

"Enhanced Penalty" Blood Alcohol Concentration (BAC) Level
Many states impose harsher penalties on DUI offenders with a particularly high BAC at the time of the offense, typically .15 to .20 percent. DUI offenders with a BAC at or above their state's enhanced penalty standards will likely face additional jail time, harsher fines, and more severe driver's license sanctions.

"Implied Consent" Laws
"Implied consent" laws require vehicle drivers to submit to some form of chemical test, such as breath, blood, or urine testing, if suspected of DUI. If a driver refuses to submit to such testing, implied consent laws carry penalties such as mandatory suspension of a driver's license, usually for six months to a year.

Note: Persons arrested for DUI will be subject to additional criminal law penalties not addressed here -- including jail time, fines, and community service. Such criminal penalties are typically more discretionary than those identified in this chart, and are therefore more difficult to accurately predict. Generally speaking, first-time DUI offenders can expect to incur a fine, and face the possibility of jail time. Repeat DUI offenders will incur harsher fines, and will almost certainly be sentenced to a number of days in jail. Penalties will be harsher still if the DUI offender was involved in an accident in which someone else was injured or killed.

Note: the penalties identified here do not include variations for DUI offenders operating commercial vehicles, or drivers who have violated "zero tolerance" and "enhanced penalty" DUI laws (see Table 1). Most states recognize different sanctions for these types of DUI offenses.

Mandatory Alcohol Education and Assessment/Treatment
Alcohol education and treatment/assessment penalties for DUI offenders can include mandatory attendance at DUI prevention programs, and assessment of potential alcohol dependency problems. Such programs are often made "conditions" of a suspended sentence or probation, meaning that a DUI offender can avoid jail time and payment of hefty fines if he or she completes participation in the program. This chart indicates each state's utilization of alcohol education and treatment/assessment programs.

Vehicle Confiscation
Vehicle confiscation penalties allow a motor vehicle department or law enforcement agency to seize a DUI offender's vehicle, either permanently or for a set period of time. Such penalties typically apply only to repeat DUI offenders, and often the return of the vehicle requires payment of fines and significant administrative costs. This chart indicates each state's utilization of vehicle confiscation as a penalty for DUI.

Ignition Interlock
A vehicle ignition interlock breath-testing device measures a vehicle operator's BAC, and will prevent operation of the vehicle if more than a minimal amount of alcohol is detected (i.e. BAC level of .02). DUI offenders will usually be required to pay the costs of installation, rental, and maintenance of an ignition interlock device. This chart indicates each state's utilization of ignition interlock devices as a penalty for DUI.