Check out this in depth discussion on at home covid testing: https://www.youtube.com/watch?v=CjphzlV5DYo

Bottom line(s):

    * These kinds of at-home antigen tests are more likely to accurately test positive when the person is actually infectious. Yes, they do test negative when PCR can return positive, but (according to the doctor there) the PCR can often return positive when the person is no longer infectious.
    * at-home tests could easily be produced now (with some government investment) for a couple of bucks apiece (possibly even less). The low price would allow the government to send some number of these to each household and suggest that they self-test twice a week which would be enough to catch people during the actual infectious period.