You can't expect to have a drug free country 100%. Look what happened after they stop tokhang because of those extra judicial killings as several people who previously engaged in drug activity gone back on doing the same things again for the reason of there's no one monitoring them. Unless the crusade for drugs continues it can be controlled but not totally eradicated.
Only the state should act quite differently. If the government controls but does not prohibit Drugs, then there will be a different situation. Of course, the authorities can not allow this officially, but only so you can keep the system in your hands.