Supply and demand.
Our society decided, back in the 60's, that drugs of whatever kind were wonderful. They still stayed against the law, but also during the 60's, our society decided that "bad laws were made to be broken," a.k.a. relative morality.
Mexico supplies our demands. The Mafia, apparently, can't keep up with the competition, OR, uses the Mexicans because of their cheaper prices/labor too.
Hard to contain.
So maybe another capitalist group puts together a fund to provide a private security firm/bounty hunter incentive, eh? We invoice the gummit for outsourced services, we put all the seized weapons and vehicles up for public auction, make a new countering Capitalistic force! And the hospitals and their insurers would probably help us a bit, since we will decrease their emergency costs.....I'll put up the first few bucks, anybody wanna join me?