State Felony Drug Convictions
"State courts sentenced an estimated 1,132,290 persons for a felony in 2006, including 206,140 (or 18% of all felony convictions) for a violent felony (table 1.1). A drug crime was the most serious conviction offense for about a third of felons sentenced in state courts that year."
Sean Rosenmerkel, Matthew Durose and Donald Farole, Jr., "Felony Sentences in State Courts, 2006 – Statistical Tables," Bureau of Justice Statistics (Washington, DC: US Department of Justice, December 2009). p. 2.