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Impaired driving remains a serious issue nationwide. In 2024, 11,904 people were killed in alcohol-impaired driving crashes, accounting for about 30% of all traffic fatalities in the United States.
DUI and DWI are terms used for impaired-driving offenses in the United States. And understanding the terminologies and the specific requirements where the charge occurred is important because the laws differ by state.
DUI vs. DWI depends on the state where the offense occurs. Some states use DUI (Driving Under the Influence), while others use DWI (Driving While Intoxicated or Impaired). There are also specific legal definitions and specifications that need to be understood under this law. This includes blood alcohol concentration (BAC) limits and penalties, which also vary by jurisdiction.
Let's take a closer look at how DUI and DWI charges differ and what these terms can mean under state law.
The Difference Most People Expect Doesn't Usually Exist
Some people may assume that DUI and DWI are two different offenses. As such, they would also determine that punishments for both are also different. But that is not always the case.
A Statesville DWI lawyer in North Carolina, for instance, is answering the same question whether a client calls it a DUI or a DWI arrest. That is because North Carolina law recognizes only one offense for impaired driving.
What actually differs from state to state isn't a split between two charges. It's which name a particular state's legislature happened to attach to its impaired driving statute.
Why North Carolina Only Uses One Term
North Carolina is an obvious case wherein the two concepts are synonymous with each other. Prior to the year 1983, the state did have a separate DUI offense complete with its own penalty system.
Still, the Safe Roads Act enacted by the state in 1983 abolished this system altogether, substituting it with the single offense of DWI under North Carolina General Statute 20-138.1. Even now people refer to this offense as DUI through force of habit, although it doesn't exist as a separate offense any more.
Where the Terminology Actually Comes From
This division between DUI and DWI is mainly an issue of what acronym the legislatures of specific states used decades ago, and it does not indicate any difference between two legal concepts.
Some states refer to DUI, others to DWI, while there are also some states that use completely different terms such as OWI or OVI. However, in most cases, the acronym refers to the single impaired driving law within the specific jurisdiction, just like the term "DWI" in North Carolina.
Where a Real Difference Does Show Up
The state of Oregon provides a good illustration of an instance where there is a need for further layers of the analysis, although we should note that it is important to get a clear idea of the layers involved.
In Oregon, the state statute related to driving under the influence of intoxicants is ORS 813.010, which specifies only one offense in the form of driving under the influence of intoxicants.
There are two different ways of proving that one offense. The blood alcohol concentration is at least 0.08 percent, or that the ability of the driver to drive has been affected irrespective of the blood alcohol concentration.
Some sources claim that these two instances represent two different offenses known as DUI and DWI.
Why This Distinction Still Matters for a Defense
Though there may be just one basic crime, the way in which the prosecution elects to establish the defendant's impairment may have an important impact on the case. A case that relies upon the reading of the BAC is very dependent upon the accuracy of the tests, administration, and calibration of the testing equipment.
A case where the arrest is based on officer observation of impairment generally relies on the procedure followed in administering the field sobriety tests and whether the initial stop was justified.
What Actually Determines the Penalties
No matter how the act of crime is referred to, the penalty for driving under the influence is highly influenced by the following factors: BAC level of the driver, history of previous convictions, children in the vehicle, and injury or damage caused by the act of crime. Those factors are what shape the penalties for a DUI, not which of the two acronyms appears on the citation.
The punishment structure for a first impaired driving offense where the law describes it as DUI is not much different from a first impaired driving offense where the law describes it as DWI.
What to Take Away From This
While the label that is used on a charge for impaired driving is insignificant compared to the exact statute that applies to the case, DUI and DWI are actually just two labels for what is the exact same law in most states.
In some other states, such as Oregon, they simply represent alternative names for proving the same crime using two different approaches. However, it should be noted that these names have no real importance by themselves since there is always something much more important than what it's called.
For a driver, the practical questions come after the charge rather than before it, and they are the ones with a direct cost attached: what the statute in that state actually requires, and how to get a license back after a conviction.