> From the link Doug sent.
>Search for the Truth in Sentencing Report on the usdoj.gov bjs site.
I think you're talking about this. http://www.ojp.usdoj.gov/bjs/pub/pdf/tssp.pdf
That report is from 1999 and excludes offenders with a sentence of less than one year.
In 2005 the state percentage for drug offenses was 20%. Ten years earlier it was 22.
http://www.ojp.usdoj.gov/bjs/prisons.htm