At-home Covid test kits become scarce as new questions arise about accuracy

"If you lined up a hundred people and you tested them with a rapid at-home test 85 percent of those people would get an accurate reading, 15, you wouldn’t," said Rauner. "You have to make sure that you read and follow the instructions on each at-home kit perfectly. You can’t deviate from what they say, or the test becomes invalid."