There is not a "legally enforceable" version in Michigan. A store owner can post a sign stating, "No Backpacks" (yes, I've seen one ) If you enter wearing a backpack, you are trespassing.It's being removed is only temporary. They are having a legally enforceable version printed. A constitutional pro-gun supporter pointed out to them that their sign was not enforceable as it was not a legal "no guns allowed" sign.
At least in Texas, it must be a proper 30.06 sign to be enforceable.
It is great that you are so positive but You cannot fix stupid.
Our laws about this are very similar to yours. No Guns signs carry no weight of law but if you are asked to leave and you refuse, the store can summon the police in order to press charges of trespassing. However, seeing any signs like this here is very rare.Oh certainly, money enters the picture and lots of things change. Here in Indiana I don't think there are any legally enforceable signs. At least I've never seen any of the enforceable ones. About all that can be done here is a trespass charge if you're found out, asked to leave and don't. Indiana is a pretty relaxed state to begin with. At least for now.
I shop Washington Square occasionally and always enter through a store door like Dick's or something. I've never seen any signs posted on them. They seem to only be at the main Mall entrances.A mall by me, Washington Square in Tigard OR has a posting, but they placed it so no one will see it. It is not on the entry doors, it is off to the side and is on an 8" x 11" sheet of printer paper. It is in type the same font size that this post is. It lists all of the mall's rules, which are many. No skate boards, vulgar language, ect. All weapons are banned, including pocket knives. It even has a dress code. No wonder they don't want anyone to read it, imagine telling teen age girls their clothes are too revealing to shop in this mall. Boy they would loose more $ over that than banning those carrying concealed firearms.
I have to give the mall credit. They have posted rules banning weapons that they can provide to their insurance company, but posted them where no one will ever see them. Note, in Oregon there is no law or regulation on what type of sign is posted and they have no force of law other than trespassing if you refuse to leave when asked.