So, basically the story premise is that the police chief wants to sterilize addicts so they don't breed more drug addicts.? And the drug lord is too short-sighted to realize that by going along with the scheme he's trading short term protection for the long term loss of the next generation of potential drug users -- he's undercutting his own market.
Okay...
And then what happens?? As a result of this scheme, what jeopardy is the police chief (the protagonist) putting himself in?? What dramatic problem does it create?? What nemesis arises - who threatens to expose him and defeat his scheme?