Schneier seems to misunderstand this as well. Contact tracing is to find the next people to test, because you can't test everyone every week. Schneier calls it

Schneier seems to misunderstand this as well. Contact tracing is to find the next people to test, because you can't test everyone every week. Schneier calls it a "false positive" when transmission doesn't occur, but as far as contact tracing goes, it's only a false positive if no transmission could have possibly occurred.