Last week officers with the Sacramento County Sheriff’s Department arrested Joseph James DeAngelo, the suspected Golden State Killer who allegedly committed a dozen murders, at least 50 rapes, and more than 100 burglaries in California between 1976 and 1986. Police made the arrest after uploading DeAngelo’s “discarded DNA” to one of the increasingly popular genealogy websites. Using information from the site, investigators were able to find DeAngelo’s distant relatives, thereby significantly narrowing their list of suspects. This investigatory technique is worth keeping an eye on, not least because millions of people are using DNA-based genealogical sites.
I’m one of them. I’ve signed up to 23andMe as well as MyHeritage, both of which offer DNA analysis. I did this in part because family history is a minor hobby of mine, but also because 23andMe offers interesting medical information. While both companies offer a DNA service, I’ve only used 23andMe’s because MyHeritage allows its users to upload 23andMe data. One of the features of MyHeritage is its “DNA Matching” service, which updates me when a distant relative is found thanks to automated DNA analysis.
This month alone MyHeritage has altered me to the existence of two more 3rd - 5th cousins. This DNA Matching service has identified hundreds of my distant relatives, with varying degrees of confidence. 23andMe has a similar relative-finding feature. MyHeritage and 23andMe, as well as Ancestry.com, have all denied working with law enforcement in the Golden State Killer case.
According to The New York Times, investigators sent the suspected Golden State Killer’s DNA to GEDmatch, a free genealogical service. A GEDmatch release stated that it had not been approached by law enforcement and warned customers, “If you are concerned about non-genealogical uses of your DNA, you should not upload your DNA to the database.”