Without knowing more of the facts, it would be hard to make any kind of judgment. You may be able to find a lawyer through the folks at Georgia Carry : An information clearinghouse for Georgia Firearms License issues and news. The issue would probably revolve around private property rights and the rules of your husbands workplace. Was the parking lot private property (owned by the company) and did they have rules prohibiting the carry of guns on their property? Ultimately, our Second Amendment rights do not trump other peoples private property rights.
We may get better response from some of the more legal minded folks here. Lots f knowledge and experience.