Sqad..in the same way that drunk-driving, and smoking in crowded places have been dealt with...by more action and less sitting on our hands.
I remember in the 1960s when the breathalyser was first introduced...it was such a infringement of peoples rights and freedoms, that the whole world was going to end if drunks couldn't get behind the wheel any more. Now we view this activity as morally indefensible. The same goes with smoking...its only a few years ago that Pubs and cafes stunk of cigarette smoke, with overflowing ashtrays on every table. Now, even in tough areas, like where I live, there are orderly groups of men, standing outside Pubs in the rain, puffing away. Who would have thought that would happen, less than 10 years ago ?
I realise its not a easy problem but my nieces and nephews tell me that the night clubs that they attend are full of drug dealers, and the toilets resemble a busy branch of Boots. If everybody knows this is going on, then I fail to see why the authorities just stand back and let it happen.