In addition to which, by keeping goods out and by arresting, let's say, local marijuana growers, the government keeps the price of these products high. What more could a monopolist want? He's got a government who makes it very hard for all his competitors and who keeps the price of his products high. It's absolutely heaven.
Source, in case someone is interested in reading more: http://www.druglibrary.org/schaffer/misc/friedm1.htm
I'm pretty libertarian and everything Milty says makes sense. And I get what you're saying. But 'absolutely heaven' is a bit of a stretch, especially in that unregulated, illegal drug game where a dispute is solved with force.
Search this page for deceased or captured to see what I mean http://en.wikipedia.org/wiki/List_of_Mexico%27s_37_most-want...
http://www.businessinsider.com/the-us-government-and-the-sin...
This is actually the opposite of what's going on in Mexico. The large drug organizations have splintered into regional groups. There is no need for fleets of planes, Mexicans drive drugs the border and smuggle them the same way they have for hundreds of years. (Through underground tunnels, empty parts of the desert, and by bribing/sneaking in through customs.)
Well, there has been some innovation.
http://www.cnn.com/2015/01/22/world/drug-drone-crashes-us-me...