There was a time, a few months ago, when an underage girl visited Leora & Paul's apartment to either pick something up, or drop something off. They knew she was coming, so when the girl knocked on the door, Leora threw a blanket over the camera in the hallway before she let the girl in (it was a loose woven blanket and you could still see through it a little bit). They never let the visitor go past the hallway into the apartment and as soon as she left (a few minutes later), they removed the blanket from the camera.
I've heard from reputable sources, that no underage guests are allowed to stay with the contracted tenants of RLC and all adult guests must be informed of the cameras, where they are located and sign a release before they are allowed to visit. Even pizza delivery guys either sign a release or can't be shown on camera.