Rules for employees can be changed at any time, same with how they're administered/applied, even varying depending on whether they like you or not. Couple with that, the fact that Ohio is an "at will" employment state. A company could fire you for disclosing the fact you have a gun in your vehicle, then just tell you a different reason for the termination.
The new law passed in Columbus is about as solid as watered down oatmeal.
"I have decided not to vote, speak in public, assemble in groups or petition my government either directly or by writing to the newspapers.
Some ignorant person may become alarmed, and we can't have that.''