[Yosemitest]

An Executive Order carries the weight of "Law" and is a power of a duel elected Governor>
But I can find no such law (Executive Order).
All I can find is Governor Reeves strongly recommending we wear masks, and NOT a requirement to wear a mask in a grocery store.

Now I did find DEMOCRAT Meridian Mayor Percy Bland said businesses and shoppers MUST wear face coverings when the stores open.

[GreyHoundSailor]

If confronted, simply state that you have a medical condition preventing use of a mask. Medical privacy laws state that you aren’t required to share that info with anybody.