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Thanks, here's the article below linked.My understanding is they collected DNA after both arrived back in PA. The airplane that transported BCK to Idaho had made an earlier trip from PA to Moscow/Pullman regional airport. MOO This was to transport DNA evidence. The genetic link was the “pivitol” evidence for issuing arrest warrant MOO.
First the DNA on the sheath was found to be related to a family tree already.
They collected garbage after both were in PA. The father's DNA was found on garbage. It showed him to be the father of the male DNA on the sheath. BK was arrested the next day.

How a family tree and DNA identified Idaho murder suspect Bryan Kohberger
Detectives sent DNA to a private lab in one of the first cases of using genealogy to solve a hot case.
