Kwik Trip review: Employee running cash register without a mask

I have been to this store on many occasions to find the same employee not wearing a mask while waiting on customers at the cash register. Signs clearly state masks must be worn. I was told she cannot wear a mask. I stated she could wear a face shield. Contacted Kwik Trip and told some of these issues are worked out with HR. I would suggest avoiding this Kwik Trip during the time that Covid runs rampant in the state of MN.