I saw a documentary, not so long ago from one city in Napoli, where it were the biggest drug dealing in Europe, the drug dealers do it all in the walls, most of

I saw a documentary, not so long ago from one city in Napoli, where it were the biggest drug dealing in Europe, the drug dealers do it all in the walls, most of them didn't know how to sum properly. They made so much money that kind of errors were normal.