Allow me....
http://www.according2prophecy.org/24colleague.html
"Prof. Karl Skorecki, a senior nephrologist (blood specialist) at Rambam Hospital in Haifa is the head of molecular medicine at Israel's Technion's medical school. He and his colleagues published their findings in Nature, a British science journal."
Note that they found a common genetic trait among males who claimed to be of the Aaronic tribe. They did not prove that this genetic trait was passed down from Aaron; despite how the article reads.
I'm sure God is eternally awed
by our notions and standards of scientific "fact."
I'm sure the evolution bit just knocked God's socks off on that score.
The assertions of generations of family members coupled with the DNA evidence is probably sufficient for the training priests to believe that they won't be terminated for taking on the role.
God is a lot freer to act outside the box doing and proving whatever He wishes to His satisfaction whenever and however He chooses to. And, given that HE'S THE AUTHORITY on who should serve as Israel's priests, I'm confident there won't be a big problem.
So there is no scientific proof, just hypothesis.
And those who doubt?
In Zoossmann-Diskin's summary, he writes that "Careful examination of their [Skorecki's and Thomas's] works reveals many faults that lead to the inevitable conclusion that their claim [that most Cohenim share a common origin] has not been proven. The faults are: the definition of the studied communities, significant differences between three samples of Jewish priests, failure to use enough suitable markers to construct the Unique-Event-polymorphisms haplotypes, problematic method of calculating coalescence time and underestimating the mutation rate of Y chromosome microsatellites. The suggestion that the 'Cohen modal haplotype' is a signature haplotype for the ancient Hebrew population is also not supported by data from other populations."The Christian Zionists want to believe so badly they will pick up any theory and run with it.