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> When I signed up the sample they took was spit in a vial.

Yes, and? I don't see the significance of the testing medium here. DNA sequencing from hair or blood or saliva will yield identical results.

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They're saying the testing medium itself made the test appear less scientific/accurate (to them) than it actually is. Perhaps if it had been a hair sample it would have appeared more scientific (again, to them).

Yes that's right.

Yup and in both sources, it will be multiplied first via polymerase chain reaction, and then analyzed / sequenced.

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