If you actually read the treaties, while they do set firm limitations on the legal, "non-medical" or "non-scientific" sale of schedule drugs — limits that Uruguay, Colorado and Washington ignored when legalizing cannabis — they don’t otherwise obligate countries to penalize drug use. Even the 1988 convention, the harshest of the three, which instructs countries to criminalize use, still provides an out for states, allowing such laws only as they are "subject to its constitutional principles and the basic concepts of its legal system." This loophole has been used by the Dutch to argue legally for their coffee shops.
The International Narcotics Control Board (INCB) has launched a counter-offensive against moves to liberalise drug laws around the world, warning that cannabis legalisation poses a grave danger to public health.
The Uruguayan government has made a controversial move to regulate the production and sale of cannabis, believing that this will help in the fight against drug-related crime and in dealing with public health issues. The move has been condemned by the UN’s International Narcotics Control Board (INCB), whose president Raymond Yans accused the government of having a "pirate attitude" for going against the UN’s conventions on drugs. Diego Cánepa, secretary of the office of Uruguayan President, believes a regulated marijuana market was the right decision.