Carlos is the manager of a fast-food restaurant in California. He has seven employees on the early shift. One morning, one of his employees does not come to work. He calls Sandra, who worked the late shift the night before, to see if she can come in. Sandra is still tired from the night before but says she'll come in to help out. When Sandra shows up, she seems lethargic. Carlos figures she is just tired. However, he has to remind her of basic sanitation rules such as wearing gloves. He also notices that she has to go to the bathroom often, and she complains of a headache. What do you think Carlos should do?