Why does the store manager even question it? Okay. You have a condition. Can’t wear a mask. I believe you. That’s why we have the pickup service. Now please leave the building or put on a mask.This ^^^^. I suspect if you wish to claim an exemption the burden of proof will be on you. They can't make you provide the proof, you can't make them provide the exemption. Mexican standoff (is it still allright to use that term? )