How many DUI cases are there per year?

About 1,396,888.

From 2000 to 2008, there are on average about 1,396,888 arrests made per year for driving under the influence (DUI) in the United States. This is based on Uniform Crime Reports from 2000 to 2008 of the U.S. Federal Bureau of Investigation. The total number of DUI arrests from 2000 to 2008 is 12,571,993.