The traditional offense is "driving under the influence of alcohol" (DUI) or, in some states, "driving while intoxicated" (DWI). In recent years, however, 43 states have also enacted a second, so-called "per se" offense: driving with an excessive blood-alcohol concentration (either .08% or .10%). In those states, BOTH offenses are charged. The defendant can even be convicted of both, but can be punished for only one.

If the case involves a refusal to submit to chemical testing, of course, only the traditional offense will be charged.