I dare say Mark will want to comment on this, but I’ll beat him to the punch with the news. Uruguay’s Senate has passed the marijuana legalization law by a party-line vote. Text in Spanish of the version passed by the lower house of parliament. Infographic in English on the new policy. It’s not clear whether there were any amendments in the Senate, but I suppose the news reports would have covered anything major. The act still has to be signed by the President, Jose Mujica - a foregone conclusion as he was its prime mover. More important, according to TPM:
Uruguay’s drug control agency will have 120 days, until mid-April, to draft regulations imposing state control over the entire market for marijuana, from seed to smoke.
I haven’t seen anything on Uruguay’s next move under the UN Single Treaty - denunciation, reservation, or (most ambitiously) proposing a rewrite.