Experts call it a major game-changer for cold-case investigations: DNA and genetic genealogy. These methods can also identify living people. For example, DNA profiles pulled from publicly available ancestry websites were used to identify and arrest The Golden State Killer for a series of murders dating back to the 1970s and 80s. Cece Moore is chief genetic genealogist with Parabon Nanolabs and PBS’s Finding Your Roots with Henry Louis Gates, Jr. She talked about the relationship between DNA and law enforcement.