Theodore Schurr of the School of Arts and Sciences said U.S. Sen. Elizabeth Warren’s genetic analysis, which used indigenous DNA samples from Peru, Mexico, and Colombia as reference points, was legitimate due to historical migration patterns.
http://www2.philly.com/philly/health/elizabeth-warrens-dna-test-how-reliable-is-it-a-penn-prof-explains-20181016.html Philadelphia Inquirer