A DUI Attorney is a legal professional that you would hire if you get arrested for driving while drunk. In some states drunk driving is referred to as a DUI (driving under the influence); in other states it is referred to as a DWI (driving while intoxicated). It is also not uncommon for it to be referred to as an OUI (operating under the influence) as well. Getting arrested for driving while you are impaired by any substance is a very serious crime and driving offence. This is largely because it can cause all sorts of traffic problems.