In 2001 the Surgeon General placed D.A.R.E. on the list of ineffective government programs. It simply does not work.
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Rather than simply beat the idea that drugs are bad because we said so into kids' brains, which apparently does not work, the goverment should teach kids about drugs in terms of the social and legal consequences of doing drugs. I.E. teach them about proven harms associated with various drugs, not just lumping all drugs together, and letting them decide on their own.