"In my 20s I was so ignorant about drugs, and so naive. I mean, my band was smoking marijuana for years; I didn't even know what a joint was. And I'd never seen a line of cocaine in my life. And I don't know whether it was bravado or - OK, I'll join in. But my stupidity, I had a line of coke, and that started the whole process."

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The policy that received more attention particularly in the past decade and a half or so has been the US cocaine policy, the differential treatment of crack versus powder cocaine and question is how my research impacted my view on policy. Clearly that policy is not based on the weight of the scientific evidence. That is when the policy was implemented, the concern about crack cocaine was so great that something had to be done and congress acted in the only way they knew how, they passed policy and that's what a responsible society should do.

— Carl Hart