Who do you think you are? What DNA tests reveal—and what they don't

Who do you think you are? What DNA tests reveal—and what they don't

For more than 40 years, the Golden State Killer haunted California. A serial rapist and murderer active in the 1970s and '80s, he eluded detectives for decades. By 2018, hope of identifying him was fading, until a woman—curious about her ancestry—spat into a plastic tube and mailed it to a genealogy company.