Understanding DUI/DWI Laws
Driving Under the Influence (DUI) or Driving While Intoxicated (DWI) laws vary significantly by state. Understanding your state's specific laws, penalties, and procedures is crucial for both prevention and legal defense.
DUI, DWI, OWI, or OUI? What Your State Calls It
The offence is essentially the same everywhere — operating a vehicle while impaired — but the statutory name changes at the state line, which is why the same conduct is charged under four different acronyms across the country.
- DUI — Driving Under the Influence. The most common label, used in California, Florida, Arizona, Pennsylvania and most other states.
- DWI — Driving While Intoxicated (or Impaired). Used in Texas, New York, New Jersey, Missouri and North Carolina. A few states use DWI and DUI side by side for different impairment levels.
- OWI — Operating While Intoxicated. Used in Wisconsin, Michigan, Iowa and Indiana. “Operating” is broader than “driving”, so it can reach a person sitting in a stopped car with the engine running. See what an OWI means in Wisconsin.
- OUI — Operating Under the Influence. Used in Massachusetts and Maine. See Massachusetts OUI laws.
The label matters less than the elements. Whatever the acronym, a prosecutor must show that you operated a vehicle and that you were either over the per se BAC limit or impaired to a degree that made safe operation impossible. Our full comparison of the four terms is in DUI vs. DWI vs. OWI vs. OUI.
Key Terms
- BAC: Blood Alcohol Concentration (percentage of alcohol in blood)
- Per Se Law: Automatic DUI if BAC exceeds legal limit
- Zero Tolerance: Lower BAC limits for drivers under 21
- Implied Consent: Agreement to testing by holding a license
- IID: Ignition Interlock Device (breathalyzer for starting vehicle)
- Administrative Suspension: DMV suspension separate from criminal case
DUI Penalties by State - First Offense
| State | Legal BAC | Jail Time | Fine Range | License Suspension | IID Required | Points |
|---|---|---|---|---|---|---|
| Alabama | 0.08% | Up to 1 year | $600-2,100 | 90 days | 6 months (0.15%+) | N/A |
| Alaska | 0.08% | 72 hours min | $1,500 min | 90 days min | Yes, 12 months | N/A |
| Arizona | 0.08% | 10 days min | $1,250 min | 90-360 days | Yes, 12 months | 8 |
| Arkansas | 0.08% | 24 hours-1 year | $150-1,000 | 6 months | BAC 0.15%+ | 14 |
| California | 0.08% | 48 hours-6 months | $390-1,000 | 6 months | Counties vary | N/A |
| Colorado | 0.08% | 5 days-1 year | $600-1,000 | 9 months | BAC 0.15%+ | 12 |
| Connecticut | 0.08% | 48 hours-6 months | $500-1,000 | 45 days | Yes, 1 year | N/A |
| Delaware | 0.08% | Up to 6 months | $500-1,500 | 12 months | BAC 0.15%+ | N/A |
| Florida | 0.08% | Up to 6 months | $500-1,000 | 180 days-1 year | BAC 0.15%+ | N/A |
| Georgia | 0.08% | 24 hours-12 months | $300-1,000 | Up to 1 year | 2nd offense | N/A |
| Hawaii | 0.08% | 48 hours-5 days | $150-1,000 | 1 year | Yes, 1 year | N/A |
| Idaho | 0.08% | Up to 6 months | Up to $1,000 | 90-210 days | BAC 0.20%+ | N/A |
| Illinois | 0.08% | Up to 1 year | Up to $2,500 | 1 year min | Yes, 1 year | N/A |
| Indiana | 0.08% | Up to 60 days | Up to $5,000 | Up to 2 years | Court discretion | N/A |
| Iowa | 0.08% | 48 hours-1 year | $625-1,250 | 180 days | BAC 0.10%+ | N/A |
| Kansas | 0.08% | 48 hours-6 months | $750-1,000 | 30 days | BAC 0.15%+ | N/A |
| Kentucky | 0.08% | 2-30 days | $200-500 | 30-120 days | BAC 0.15%+ | N/A |
| Louisiana | 0.08% | 10 days-6 months | $300-1,000 | 1 year | BAC 0.15%+ | N/A |
| Maine | 0.08% | 48 hours min | $500 min | 150 days | 2 years (0.15%+) | N/A |
| Maryland | 0.08% | Up to 2 months | Up to $1,000 | 6 months | Yes, 6 months | 12 |
| Massachusetts | 0.08% | Up to 2.5 years | $500-5,000 | 1 year | 2nd offense | N/A |
| Michigan | 0.08% | Up to 93 days | $100-500 | 30 days + restricted | BAC 0.17%+ | 6 |
| Minnesota | 0.08% | Up to 90 days | Up to $1,000 | Up to 90 days | BAC 0.16%+ | N/A |
| Mississippi | 0.08% | Up to 48 hours | $250-1,000 | 30-90 days | 2nd offense | N/A |
| Missouri | 0.08% | Up to 6 months | Up to $1,000 | 30 days | 2nd offense | 8 |
| Montana | 0.08% | 24 hours-6 months | $600-1,000 | 6 months | BAC 0.16%+ | N/A |
| Nebraska | 0.08% | 7-60 days | $500 | 6 months | Yes, 1 year | 6 |
| Nevada | 0.08% | 2 days-6 months | $400-1,000 | 185 days | BAC 0.18%+ | N/A |
| New Hampshire | 0.08% | Court discretion | $500-1,200 | 9 months-2 years | Yes, 12 months | N/A |
| New Jersey | 0.08% | Up to 30 days | $250-400 | 3 months | Yes (varies) | N/A |
| New Mexico | 0.08% | Up to 90 days | Up to $500 | 1 year | Yes, 1 year | N/A |
| New York | 0.08% | Up to 1 year | $500-1,000 | 6 months min | Yes, 12 months | N/A |
| North Carolina | 0.08% | 24 hours-60 days | Up to $200 | 1 year | BAC 0.15%+ | N/A |
| North Dakota | 0.08% | Up to 30 days | $500 min | 91 days | BAC 0.18%+ | N/A |
| Ohio | 0.08% | 3 days-6 months | $375-1,075 | 1-3 years | Court discretion | 6 |
| Oklahoma | 0.08% | 10 days-1 year | Up to $1,000 | 180 days | Yes, 18 months | N/A |
| Oregon | 0.08% | 48 hours-1 year | $1,000-6,250 | 1 year | Yes, 1 year | N/A |
| Pennsylvania | 0.08% | 6 months probation | $300 | No suspension | BAC 0.10%+ | N/A |
| Rhode Island | 0.08% | Up to 1 year | $100-400 | 30-180 days | BAC 0.15%+ | N/A |
| South Carolina | 0.08% | 48 hours-90 days | $400-1,000 | 6 months | BAC 0.15%+ | N/A |
| South Dakota | 0.08% | Up to 1 year | Up to $2,000 | 30 days min | Court discretion | N/A |
| Tennessee | 0.08% | 48 hours-11 months | $350-1,500 | 1 year | Yes, if BAC 0.20%+ | N/A |
| Texas | 0.08% | 3-180 days | Up to $2,000 | 90 days-1 year | BAC 0.15%+ | N/A |
| Utah | 0.05% | 48 hours-6 months | $700 min | 120 days | Yes, 18 months | N/A |
| Vermont | 0.08% | Up to 2 years | Up to $750 | 90 days | BAC 0.16%+ | N/A |
| Virginia | 0.08% | Up to 12 months | $250-2,500 | 1 year | BAC 0.15%+ | N/A |
| Washington | 0.08% | 24 hours-364 days | $990.50-5,000 | 90 days | Yes, 1 year | N/A |
| West Virginia | 0.08% | Up to 6 months | $100-500 | 6 months | BAC 0.15%+ | N/A |
| Wisconsin | 0.08% | None (civil) | $150-300 | 6-9 months | BAC 0.15%+ | 6 |
| Wyoming | 0.08% | Up to 6 months | Up to $750 | 90 days | Yes, 6 months | N/A |
Enhanced Penalties
Most states impose enhanced penalties for:
- High BAC: Usually 0.15% or 0.16% and above
- Minors in Vehicle: Child endangerment charges
- Accidents: Property damage or injuries
- Refusal to Test: Often worse than DUI penalties
- Commercial Drivers: Lower BAC limit (0.04%)
- Multiple Offenses: Within 5-10 year lookback period
Zero Tolerance Laws (Under 21)
All states have zero tolerance laws for drivers under 21:
- BAC limits typically 0.00% to 0.02%
- License suspension 30 days to 1 year
- May require alcohol education programs
- Can affect college admissions and financial aid
Implied Consent and Test Refusal
Consequences for refusing chemical testing:
- Automatic license suspension (often longer than DUI)
- Suspension periods: 90 days to 2 years
- Can be used as evidence in court
- May still be prosecuted for DUI
- Some states require IID for refusal
Ignition Interlock Device (IID) Requirements
Mandatory IID States (First Offense)
Alaska, Arizona, Connecticut, Hawaii, Illinois, Nebraska, New Hampshire, New Mexico, New York, Oklahoma, Oregon, Utah, Washington, Wyoming
IID for High BAC or Refusal
Most other states require IID for BAC above 0.15% or test refusal
License Reinstatement Requirements
Common requirements to reinstate license:
- Complete suspension period
- Pay reinstatement fees ($50-$500)
- Provide SR-22 insurance (high-risk)
- Complete alcohol education program
- Install ignition interlock device
- Pass written and/or driving tests
DUI Defenses and Considerations
- Field Sobriety Tests: Not always reliable or required
- Breathalyzer Accuracy: Can be challenged in court
- Rising BAC Defense: BAC was below limit while driving
- Medical Conditions: Can affect test results
- Improper Stop: No probable cause for traffic stop
- Miranda Rights: Must be read before interrogation
Long-Term Consequences
- Criminal Record: Misdemeanor or felony conviction
- Employment: Job loss or difficulty finding work
- Insurance: Rates increase 50-200%
- Professional Licenses: May be suspended or revoked
- Travel: Canada and other countries may deny entry
- Housing: Difficulty renting or mortgage approval
- Education: Loss of scholarships or admission
Alternative Sentencing Options
Many states offer alternatives for first offenders:
- Diversion programs
- Deferred adjudication
- House arrest with electronic monitoring
- Community service
- Victim impact panels
- DUI court programs
- Treatment programs instead of jail