Bolivian coca amendment to Single Convention

The Bolivian government has successfully commenced the formal process for amending the UN’s Single Convention on Narcotic Drugs (1961) to eliminate the provision that would require all countries to prohibit coca leaf chewing within 25 years (for Bolivia, that was 2001).
Interesting amendment process. If no country objects within 18 months, then the amendment passes (a nice, if time consuming, way to do it – countries need not get on the record to approve it). Countries most likely to object: United States and Sweden. If that happens, then there’s a conference to consider it.
The proposal has a very nice argument as to why this provision should be removed from the Single Convention.