I have been hoping this would occur and it appears to be moving forward. In Tennessee a private sign (policy) carries the full weight of a law.
http://bearingarms.com/jenn-j/2016/06/28/want-a-gun-free-zone-tennessee-says-thats-on-you-literally/
http://bearingarms.com/jenn-j/2016/06/28/want-a-gun-free-zone-tennessee-says-thats-on-you-literally/