The terms DUI and DWI are often used interchangeably, but they can mean different things depending on your state.
DUI — Driving Under the Influence
Used in most states including California, Florida, and Arizona. Generally refers to operating a vehicle while impaired by alcohol or drugs.
DWI — Driving While Intoxicated/Impaired
Used in states like Texas, New York, and Missouri. In some states, DWI specifically refers to alcohol impairment while DUI covers drugs.
Other Terms by State
Ohio uses OVI (Operating a Vehicle Impaired), Indiana uses OWI (Operating While Intoxicated), Maine uses OUI (Operating Under the Influence), and Oregon uses DUII. Despite different names, the legal concepts are similar.
States That Use Both Terms
Some states like Maryland and New York distinguish between DUI and DWI based on BAC level. In Maryland, DWI (0.04-0.07%) is a lesser charge than DUI (0.08%+).