Professor Mary Keogan:

There is a single line at the c-bar. Obviously I would not be handling it without gloves if it had any biological material on it. What I did to produce this this morning was put butter on it. This is why self-testing is not acceptable for any sort of test-to-enable approach. If one just puts on butter with no sample one gets a negative result. The control line just tells one that diffusion has occurred. It does not indicate there is any specimen in this test. This is unlike a PCR test where one would get an invalid result if there is no ribonucleic acid, RNA, present.