Originally Posted by nrr

I have two sets (from different manufacturers) of the FREE covid test kits mailed to me by the US GOV.
Before my next trip back to the USA from Europe I plan on using two covid test kits (one from each supplier) as a “dry run” before doing the real test. If I test negative on each unofficial test, but, positive on the official test would i be safe to conclude that it was a false positive?
Some airlines are more concerned with one’s submission of the “CDC attestation form” than seeing that one actually tested negative.
So, if I “attest” that I tested negative would I be making a false statement.—I was negative 2/3 on tests taken in close proximity of each other.
A general question re GOVID testing, for the supervised (via ZOOM) testing would false positives be less likely using a “cursory” swab vs deep swabbing?