Actually, elders are suppose to stop and visit on df'd or da'd ones who no longer are "sinning" according to the Society's rules. For example, if you were df'd for immorality and are still living with someone whom you're not married to, the elders will most-likely not be stopping by. On the other hand, if you were df'd for immorality and are not in the above circumstance, the elders will keep a tab on you and probably stop by when they need to get more field service time.
Anyway, these is how I understood the instructions from the Big Cheeses in Crooklyn.