The types of DUI charges a driver can face break down into three main levels — standard misdemeanor, aggravated misdemeanor, and felony — along with separate categories tied to the driver’s age or license, and parallel charges for driving under the influence of drugs rather than alcohol. Which one applies depends on your blood alcohol level, whether anyone was hurt, how many prior convictions you have, and who was in the car with you.
Standard Misdemeanor DUI
A first-time DUI with no aggravating facts is a misdemeanor in every state, and it comes in two forms.
A “per se” DUI is based purely on your blood alcohol concentration. In 49 states the limit is 0.08%. Utah lowered its threshold to 0.05% in 2018.1National Highway Traffic Safety Administration. Lower BAC Limits Prosecutors don’t need to show you were actually impaired. The number is enough.
An impairment-based DUI doesn’t require any specific BAC reading. If an officer sees you swerving, failing field sobriety tests, or otherwise unable to control the vehicle safely, you can be charged even with a BAC below the legal limit. Some drivers are visibly impaired well before 0.08%, and prescription medications or drug combinations can affect driving without producing any alcohol reading at all.
Penalties for a standard first offense vary by state and typically include fines, a license suspension of several months, mandatory alcohol education, probation, and possible jail time. Most states also require an ignition interlock device — a dashboard breathalyzer that keeps the car from starting if it detects alcohol — for six months to a year on a first offense, longer for repeat convictions.2National Conference of State Legislatures. State Ignition Interlock Laws
Aggravated DUI
An aggravated DUI is usually still a misdemeanor, but the penalties step up sharply because the facts of the stop signal a higher level of risk.
Very High BAC
The most common trigger is an unusually high blood alcohol level. Many states set the threshold at 0.15%, roughly double the legal limit, with longer mandatory jail time, bigger fines, and extended license suspensions compared to a standard DUI.3National Conference of State Legislatures. Increased Penalties for High Blood Alcohol Content Some states add a second tier at 0.20% with mandatory minimum jail sentences even for first-time offenders.
Child Passengers
Driving drunk with a child in the car triggers enhanced penalties in nearly every state. The qualifying age ranges from under 12 to under 18 depending on the state. Most states treat it as an aggravating factor that increases the underlying DUI sentence; a handful stack it on as a separate felony.
Other Triggers
Combining a DUI with excessive speeding or reckless driving can push the charge into aggravated territory. So can driving on a suspended license at the time of the DUI, or driving the wrong way on a highway.
Felony DUI
Two things usually move a DUI from misdemeanor to felony: a long enough record of prior convictions, or a serious injury or death.
Prior Convictions and the Lookback Period
In many states, a third DUI within a certain timeframe is a felony. That timeframe is the “lookback period,” and it varies dramatically. Some states use five or seven years, others ten, and a few count every prior conviction for life. A prior inside the lookback window counts toward the number of offenses that triggers a felony. A prior outside it may not.
People get this wrong routinely. Someone with a DUI eight years back might assume the slate is clean, only to find out their state uses a ten-year lookback and the new arrest counts as a second offense. Felony DUI sentences are measured in years rather than months, with fines reaching tens of thousands of dollars and license suspensions lasting several years.
DUI Causing Injury or Death
Causing a serious injury while driving impaired is a felony in every state, no prior offenses required. When someone dies, charges can range from vehicular manslaughter to second-degree murder, with prison exposure from a few years on the low end to decades or more in the most serious cases.
Loss of Civil Rights
A felony conviction carries weight beyond the sentence. Under federal law, anyone convicted of a crime punishable by more than one year in prison cannot possess firearms or ammunition, and felony DUI sentences regularly cross that threshold.4Office of the Law Revision Counsel. United States Code Title 18 – 922 Voting rights are affected during incarceration in most states, with restoration rules that vary afterward.
Charges Based on Who’s Driving
Two groups of drivers face DUI charges on different rules than everyone else.
Drivers Under 21
Every state has a zero tolerance law for drivers under 21, setting the maximum BAC at less than 0.02% and in some states at 0.00%.5National Highway Traffic Safety Administration. Zero-Tolerance Law Enforcement If you can’t legally drink, you can’t have measurable alcohol while driving. Penalties typically include a license suspension of up to a year and mandatory substance abuse education. An underage driver who hits the standard 0.08% also faces the regular adult DUI on top of the zero tolerance violation.
Commercial Driver’s License Holders
Federal law sets a BAC limit of 0.04% for anyone operating a commercial motor vehicle — half the standard limit. A first DUI disqualifies a CDL holder from commercial driving for at least one year. A second offense means lifetime disqualification. Hauling hazardous materials at the time of the first offense raises the disqualification to at least three years.6Office of the Law Revision Counsel. United States Code Title 49 – 31310 These penalties apply whether you were driving a commercial rig or your personal car when arrested.
Driving Under the Influence of Drugs
DUI laws cover impairment from any substance: illegal drugs, prescription medications, even over-the-counter cold remedies if they affect your driving. The penalties generally mirror alcohol DUI penalties, but the proof looks different. There’s no breathalyzer for drugs, so evidence comes from blood or urine tests combined with officer observations. Many departments use officers trained through the Drug Evaluation and Classification Program, coordinated by the International Association of Chiefs of Police and NHTSA, to identify impairment and the likely category of drug involved.7International Association of Chiefs of Police. Drug Recognition Experts (DREs)
A valid prescription is not a defense. The legal question is whether the substance impaired your driving, not whether you had permission to take it. A prescription may factor into plea negotiations or sentencing, but it won’t get the charge dismissed if the evidence shows you couldn’t drive safely.
Refusing the Chemical Test
Every state has an implied consent law: by driving on public roads, you’ve already agreed to submit to chemical testing if an officer has reason to believe you’re impaired.8National Highway Traffic Safety Administration. BAC Test Refusal Penalties Refusal doesn’t make the DUI disappear. It usually makes things worse.
Nearly every state imposes an automatic administrative license suspension for refusing, often longer than the suspension for failing. Lawmakers built it that way on purpose, so refusal isn’t the rational move. Many states also let prosecutors use the refusal as evidence at trial. The U.S. Supreme Court held in 2016 that states can criminalize refusing a breath test after a lawful DUI arrest, but not refusing a blood test without a warrant.9Justia Law. Birchfield v North Dakota Civil penalties like license suspension for a blood test refusal are still allowed.
What Follows the Charge
Which category your DUI falls into shapes the consequences that outlast the sentence.
Most states require an SR-22 filing — a certificate from your insurer to the DMV proving you carry minimum coverage — typically for three years. Premiums during that period often run three to five times the pre-DUI rate and stay elevated for three to five years. Reinstatement fees, ignition interlock installation, and monthly monitoring costs come out of pocket.
A DUI shows up on criminal background checks and driving records. Employers can legally decline to hire someone with a DUI when it’s relevant to the job: delivery drivers, rideshare operators, commercial truckers, and anyone needing a clean driving record feel this first. Licensed professionals in healthcare, law, and education typically must self-report convictions to their licensing board within 30 days, and failing to report can bring discipline separate from whatever the court does.
A felony record goes further. On top of the federal firearms prohibition and potential loss of voting rights during incarceration, a felony conviction can disqualify you from certain professional licenses, public housing, federal student aid, and some government jobs. These collateral consequences aren’t in the sentencing guidelines, but for many people they end up more disruptive than the time itself.