Then given the sacredness/importance of human life, relative to the value of someone's hair, there is no reasonable justification for not requiring every airlin

Then given the sacredness/importance of human life, relative to the value of someone's hair, there is no reasonable justification for not requiring every airline passenger to shave their head before entering security, if it reduces the probability of the scanner having false negative even by a small margin. Come to think of it, there's no justification for allowing passengers to keep their clothes on as they pass through security.