In 2019, American law enforcement agencies have identified over 70 suspects using a new technique called genetic genealogy, which California detectives leveraged in 2018 to identify the Golden State Killer. In the first of a two-part series, William Brangham shares the story of the first genetic genealogy case to go to trial — and how the science behind it solved a 32-year-old double murder.
Stream your PBS favorites with the PBS app: https://to.pbs.org/2Jb8twG
Find more from PBS NewsHour at https://www.pbs.org/newshour
Subscribe to our YouTube channel: https://bit.ly/2HfsCD6
PBS NewsHour podcasts: https://www.pbs.org/newshour/podcasts