[dragonwriter]

> It could be difficult to raise money for prevention and rehabilitation purposes from the tax approach.

Maybe, but it'd be easy diverting money being spent to arrest, prosecute, and imprison people into prevention and treatment (and we're already spending money on prevention and treatment from general state and federal tax money without legalization, so with legalization and no special taxes -- just general income, sales, etc., taxes -- there'd be more money from that, even before you consider repurposing the money currently being spent on the enforcement end of the drug war that would no longer be required.)

OTOH, while there are black markets for alcohol and tobacco -- largely as an effort to evade the special taxes on those products -- the special taxes on them still bring in considerable revenue, and the black market for, e.g., alcohol is far less significant and socially problematic than when alcohol was prohibited. So, its far from clear that special "sin taxes" on legalized drugs would not be useful as a significant additional revenue source for prevention and treatment activities.