Singapore seems to run a very successful counternarcotics program. The Taliban also did a great job pre-911 and even got financially rewarded for their work.
This brings the country's total number of executions to 17 this year - the highest since 2003.
www.bbc.com
A response to: "Where Have All The Flowers Gone? Evaluation Of The Taliban Crackdown Against Opium Poppy Cultivation In Afghanistan", by Graham Farrell and John Thorne Special Focus: The Taliban and Opium - www.sciencedirect.com/science/journal/09553959
www.tni.org
Any successful narcotics eradication program is going to require a lot of boots to the face, authoritarianism, and a whole lot of State-sponsored FAFO.
Singapore generally accepts living in a heavily policed society with the tradeoff being it's one of the safest places in the World. I know people that lived there that let their elementary school children ride the subway to School, it's that safe.
It's also a place where the police will be fully within their rights to beat you up for spitting in the street so there is a tradeoff for that.