I'd say legalize it, with taxes and laws similar to alcohol. Other than it being safer for the user (as it would have to go through some sort of regulating authority to be sold), the revenue generated can provide to offset the negatives that come with it (such as driving under the influence and hospitalization/rehabilitation costs, seeing as it happens regardless of the current laws anyway). And I suppose (but can't provide any evidence of) it would put a dent in crime if drug dealers can't sell it to fund other things if it can be bought safer (and purer?) in a shop or pharmacy. Hell, the way I see it, why not legalize all drugs with high taxes and all that, seeing as it happens anyway and people choose whether to damage themselves with it (depending on the drug), only then the government can get some sort of payback from damages caused by selling it themselves.