Legalisation of cannabis is making slow but unstoppable progress across much of the developed world, many experts believe, following the end of prohibition in two US states. In Amsterdam, long famous for its coffee shops, international experts gathering to discuss cannabis regulation said the international conventions, once so heavily policed by the US, would now be increasingly flouted. Already many countries, most notably the Netherlands and Spain, have bypassed the rules.
Retail marijuana sales for adults are now legal (at least at the state level) in Colorado and Washington. Next month, voters in Alaska and Oregon may decide to follow suit. It is nearly certain that marijuana legalization will make it onto the California ballot in 2016, during a presidential election season that will generate enormous interest among young voters. Robert MacCoun looks at options for designing a marijuana proposal.