Table B.7 Cocaine Use in Past Year, by Age Group and State: Percentages, Annual Averages Based on 2006 and 2007 NSDUHs District of Columbia 5.10 [1]

DC out in front by more than a nose, historically too. Probably not just politicians at the trough though.

[1] http://oas.samhsa.gov/2k7state/AppB.htm#TabB-1