I never did respond to this...
Right now I guarantee that I can go to any city in the US with a population of about 30,000 or more and by asking just a few questions (the first of which I'd feel perfectly comfortable asking a cop) I could find out where to go to safely buy just about any illicit drug I would want (not that I want any.) These drugs would be cheaper and stronger than they would have been back when your data starts.
I call that a failure, regardless of what your data shows. BTW, picking an extreme as an endpoint won't make you a friend of many statisticians.
You can fill that blank with just about any illegal activity from prostitution to murder-for-hire.
You set up this straw man (the drug ban isn't working) just to knock it down with your simplistic statement above. As I said to you before, you sure do know how to set the bar high.
Drugs are illegal. Over a period of time (not an extreme endpoint), we have seen the usage of drug decline. That cannot be denied. My conclusion is that the program is working.