Drug warriors coming in from the cold? Calls for legal marijuana to be strictly regulated

With US support for the legalisation of cannabis/marijuana fast approaching the 50% threshold  (California's Prop 19 legalisation ballot measure recently polling the highest ever US support, at 46.1%), and a string of new referendums and Bills coming up in the next couple of years, the debate is moving from if marijuana is legally regulated, to how to regulate it properly. Arguably it was concerns about the legislation in practice rather than priciple that led to Prop 19 falling short.