But people with certain medical conditions are exempt. And the Hippa law makes it illegal to ask about their condition. So in theory there is nothing a business can do about it.
Sure they can. They an deny entry and let the customer file a complaint.
I think most stores will hopefully have their BS detector operating to determine if someone is lying if they say they are not required to wear a mask when that is not the case.
People don't have an unalienable right to shop at Walmart.