Radley Balko has the lowdown on the shakedown, with links to his work in Reason and the Local Fishwrap's very own coverage.
Bottom line? Don't get arrested for drugs in Indiana. They'll take more than your herbal/chemical amusements and your freedom. It's not why I don't do drugs* -- but it's one reason why I think those who do are fools.
* "Lips that touch amphetamines will never touch mine!" Though that falls all apart when I remember I was on Ritalin for a little while...
6 months ago