Darned shame about your friend, hope he gets off with something less than a felony due to past lack of record etc.
Yeah, Ohio has shall issue CCH and no registration etc but carrying in your car is a big no no. Empty, unloaded and ammo apart IIRC unless you are a CCH holder. And then announce that you are at first contact, don't handle unless directed.
Decent law abiding people must fear criminals and the law while criminals have nothing to fear.