26.4 percent of drivers 18 years of age and older had driven under the influence in Wisconsin, the state with the highest percent of drunk driving per person in 2006.

10.5 percent of drivers 18 years of age and older had driven under the influence in Kentucky in 2006.

15.1 percent of total drivers 18 years of age and older had driven under the influence of alcohol in 2006.

Source: drugabusestatistics.samhsa.gov