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Re:Apparent absence of covid transmission at hair salon with... by disabled on Wednesday July 15, 2020 @09:31AM (#23844933)
Non-invasive means that the means/method of testing effectively has zero potential of harm (although receiving the results could be a huge blow).

While nasal swabs are extremely low risk, they still are a test that people may try to avoid out of fear of medical procedures.

Re:Apparent absence of covid transmission at hair salon with... by jjgreen on Wednesday July 15, 2020 @09:46AM (#23845128)
That's not what it means, it is invasive if it invades, enters a part of your body which is not usually probed with foreign bodies, you anus, your urethra, deep in your nose, behind your eyes. The risk associated is orthogonal.