My student got Covid this weekend after one week at school. He said, he is the only one wearing a mask in classes. When he contacted his professors, one required documented proof be uploaded to the school website, since we had done a home test when he was home for the weekend that's all we had and our family doctor said that should be sufficient.
If you are going to relax Covid protocol and close testing sites don't put it on the student who is sick to prove they are.