That's disgusting. It sounds like a law out of the 1600's.
In the mid 80's my neighbor was selling his house that had a chain link fenced backyard. Back then it was GA law you had to have your property surveyed before you could sell it.
I was there when the surveyors came out. He told me that fence looked awfully close to my line. I said I didn't care and he told me that Mickey would have to tear that side down if it was one iota on my property. Micky and I tried to get it 6" to a foot inside his line. It ended up being 6".
I told him I'd heard that if something was on your property for 7 years it became the "squatters". He said that was BS, at least in the State of GA. He said it could be across a property line 100 years and they'd still have to tear it down.
That's been changed, but I don't know for how long.
It is crucial that you speak up if you believe your neighbor is encroaching on your property. In Georgia, a neighbor can begin to establish ownership over part of your land if they cross the boundary line and you do nothing to stop them. After seven years of silence another owner could jeopardize your ownership of the area that they have claimed as their own. For example, if the other owner builds a fence on what they believe to be the property line, it could become the property line if you do not say anything for a prolonged period of time. Preferably, you should do something beyond simply speaking with them to register your opposition in order to have concrete evidence to back up a future legal claim.
Property lines can be encroached upon in various ways. If you are involved in a boundary dispute call the Law Offices of Mark Weinstein.