Agreed. Our trash gets collected on a Tuesday, and one Tuesday morning my house was burgled by one of these waste pickers who follow the garbage collection around. The cops did find him because it could only have been one of them.  He admitted to being part of a syndicate who pretended to be waste pickers but actually wait for people to go to work and then pick through your possessions, rather than your garbage. They pose a security risk and our neighbourhood watch has thankfully decided to chase them off on Tuesdays since then.