It's time to start calling the police EVERY TIME you are approched to buy drugs. The clean up can happen if the police want it to happen and we quit walking on by saying no thanks like we have been offered a trinket. It takes effort to call, more then most are probably willing to do. So will the police come if called?
Hey how about this a reward given to the police officer when he brings in a drug dealer, with drugs. Say $40bz? Would that be enough?

Life is not about waiting for the storm to pass, it's about learning to dance in the rain.