Georgia Code 16-12-123
(b) Any person who boards or attempts to board an aircraft, bus, or rail vehicle with any explosive, destructive device, or hoax device as such term is defined in Code Section 16-7-80; firearm; hazardous substance as defined by Code Section 12-8-92; or knife or other device designed or modified for the purpose of offense and defense concealed on or about his or her person or property which is or would be accessible to such person while on the aircraft, bus, or rail vehicle shall be guilty of a felony...
Without doing an exhaustive search, I didn't see an exception clause for permit holders. At first glance, it seems MARTA is a victim disarmament zone ...
Hey VGLC, see the replied-to post, and my post that it replied-to. Comments? Do you remember hearing of that one? Know anyone we can ask for a definitive answer?