Why don't we put square footage information in the MLS in Georgia?

Whenever I work with clients from other states, they are amazed that I am not able to tell them accurate square footage information about a listed property. Quite frankly, I am on their side and wish that I could get access to this information and give it to my clients. The price per square foot is a good indicator of value. I often refer my clients to the tax records to get square footage information but find that data is notoriously incorrect. Does anyone know how this came about. What is the history and reasoning behind why agents in GA can not give out or advertise this information? I'd love to know because I get asked this often by my clients.