A Drugs Question for David Cameron

Though scarcely the main thrust of James’s most recent post, this is still notable:

Lib Dem conference delegates have just provided the press with a nice easy story, they’ve voted to set up a panel to look at the legalisation of cannabis and the decriminalisation of all drugs.

I know James is tweaking the press corps just as much as he is enjoying the Lib Dems living up to their reputation on these matters. Those wacky dope-fiends in the grow-your-own-pot party! Nevertheless, could it be possible that the sandal-wearing geography teachers (sorry, this stereotyping thing is contagious) are right? I mean, are the drug laws defensible in either moral or practical terms, let alone both? Perhaps they are (though I am not persuaded by arguments to that effect) but it is also the case that there are heaps of people who will, in private, admit they don’t work but for whom any change is, apparently, inconceivable.