Here is supposedly how drug-dealing was traditionally handled by this guy and & his cohorts in his Southern Island City (Davao, Mindnao) before he became president, as recounted to me by a Philippine national that lived in this area at one time:
A list is generated by the authorities and the administration from time-to-time, listing in numerical order and by name the drug dealers in the city, with the list posted in public places for all to see, and subsequently covered by the media.
Then every few days or so a body of one of the guys on the list, starting at the very top of the list, begin turning-up floating dead in the river. This generally happens three or four times over a period of several weeks, and is reported lavishly in the press and by word-of-mouth.
After the third or fourth guy is gone, it's usually found that most of the guys on the list have fled the area. In due time when things deteriorate again, another list is published.
* Heard second-hand here is the states, and I make no claims to accuracy except to say my source is usually pretty reliable and not prone to exaggeration.
This individual claims it's a very effective technique, and they support it.