DNA Detectives Are Searching for Killers in Your Family TreeIn April, investigators arrested a suspect in the decades-old case of the Golden State Killer after sifting through online genetic data. A growing number of services say they can use a simple swab of a consumerís genetic material to find long-lost family members or detect early warning signs of diseaseóand millions of users have eagerly shared their samples. To help track down the alleged Golden State Killer, investigators matched DNA from a crime scene to genetic data belonging to the suspectís relatives that was posted on an open-source genealogy website.