10ofRods
Verified Anthropologist
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I figured they got dna from the trash and compared it to the dna on the sheath.
That's exactly what they said they did. And that's "genetic genealogy" at its simplest (a paternity test).
So far, LE has never said they used GEDMatch, that I know of (so many things I've missed along the way, though). They had BK's DNA so the parental trash method was quickest and easiest (once they figured out the car part).
I think the PCA explains it pretty well. They had pictures of the car early on, used the WSU parking database for all Elantras, found phone numbers for all of the Elantra owners and started analyzing pings, which led them directly to BK and then to his parents' house.