UPDATE: I saw a US law shield table and asked the guy selling the insurance (he is not a lawyer but said he is a CCW instructor) the question about is going into a private business building where there is a no guns sign posted, does it carry the force of law, and he said no. He claimed all they can do is tell you to leave, and if you refuse to leave, you can then be arrested for criminal trespass.
Maybe I'm wrong but that applies to just trespassing someone in general, gun or not. He claimed it used to be a criminal offense if you entered but the law was changed a few years ago and that they have to warn you to leave first.
If there was a change to the ORC I wasn't aware of it.
the US law shield site says no guns signs at business are enforceable.
https://www.uslawshield.com/3-gun-law-myths-ohio/
When I said something to him about banks, and how 5th 3rd has a no guns sign but my bank doesn't, he then claimed all banks that are insured by the FDIC are no gun zones.
Not only is he wrong about that, the US law shield website says that he was wrong about that also.
https://www.uslawshield.com/ohio-bank-carry-myths/
In addition,
Finally, a deputy friend of mine, when I told him what this guy said, said the guy is wrong, and in his opinion it's scary that he's instructing people.
He said if you read the ORC it says absolutely nothing in there about how you must be warned to leave first before they arrest you. If you knowingly violate the no guns sign and if it is conspicuously posted, you could be subject to arrest if the police are called. You've already been warned in effect by the sign and the fact that you're carrying a loaded firearm. I looked up the relevant section of the ORC and it appears he is correct.
I happen to know of at least one business that if they see someone with a gun they won't themselves tell the person to leave, they will call the law and let them handle it, for their employees safety. Granted, some in LE might not want to arrest someone over this but if the business wants it they could potentially do it. The deputy said what I already suspected, if you had to warn the person first, it would be just like Indiana, where it doesn't carry the force of law.
I told him about the guy said about banks and the FDIC and he said he's heard that also, from some banks, but like me he knows of banks without no guns signs, and thinks the banks with no gun signs, (Like 5th3rd) just tell their customers that if asked to take the heat off of them, claiming the government is making them do it.
He is of the opinion, like me, that if 5th 3rd had allowed licensed customers to carry concealed in Cincinnati the mass shooting there might've been stopped sooner than it was.
https://en.wikipedia.org/wiki/2018_Cincinnati_shooting
So the bottom line is, I can't say US law shield is possibly giving out bad advice, just maybe one of their salespeople, who is allegedly is a CCW instructor also.