As someone who has spent much of her life patrolling sims and returning stray and inappropriate prims, let me offer a bit of caution, and a reason to strongly support Trebor's statement that this function should be performed by caretakers.
In my humble opinion (IMHO), any prim left by anyone who is not a "member" in some way or fashion of the community resident on that estate should get returned, unless there is a clear and explicit reason to leave it. This includes prims left by griefers, newbies, careless visitors and reckless drivers.
Conversely, any prim left by anyone who IS a "member" in some way or fashion of the community resident on that estate should not be returned without consultation with the prim owner, even if the presence of that prim is in egregious violation of the rules of that estate.
I make these statements in a general way, and not in particular reference to CDS, because IMHO they apply to all communities on all estates.
In theory, any resident should return prims falling into the first catagory, just like any citizen in RL *should* pick up garbage left by others. But in fact, most residents don't know all the members of the community... and when I refer to all members in prim catagory 2, I mean ALL members, even those who may not be landowners. A Caretaker, on the other hand, must have by virtue of their office an awareness of who is who and which prim is returnable and which is not.
So I do beg people in the community to adhere to the CDS tradition, which is now many years old, of referring information about wayward prims to people who's responsibility it is to know the proper way of dealing with such prims, including the Caretakers (of which we often had 3 or 4) and/or any other estate manager, such as in our case the Chancellor. Abandoning this principle will have results very harmful to our community fabric.
Sudane.........................