A couple in my congregation were marked because their son was caught smoking marajuana. The son was over 21, was not baptized or involved with the dubs in any way, but he lived at home with his parents. There was a talk in front of the entire congregation where this info was laid out for everyone and the elder asked if the parents were going to throw him out. When they refused it was made perfectly clear that the parents, both baptized publishers, were bad associates for not cutting off contact with their son. From that point on they were no longer invited to any function, most people stopped speaking to them even at meetings, and those that did still speak with them were frequently brought into the library for private meetings with the elders. It got to the point that no one spoke to them and they eventually stopped comming to the hall.