Solving Crimes

Lisa recently shared with us her thoughts on the ramifications of the Golden State Killer case where a murderer and rapist was arrested nearly 40 years after the crimes were committed, thanks to a little bit of genetic genealogy work. I am so grateful for her thoughtful analysis and consideration, and the conversations it has started. I hope you have taken a minute to listen to that podcast, and share your comments with us. 

Just three weeks after that discovery made headlines, a second police department, this time in Snohomish, WA, announced that they too had employed genetic genealogy to solve a cold case from 1987, when two high-school sweethearts were found murdered. This police department indicated they had assistance from a company called Parabon Nanolabs, a genetics company based in Virginia.  

According to their website, Parabon deals in both pharmaceuticals and something they call Snapshot, where they reconstruct the facial features of an individual based on their DNA. While they do have a press release on their website regarding the aforementioned case, they do not have a specific product on their website indicating they can take genetic material and make a DNA profile compatible with genetic genealogy databases.  But that is exactly what they must have done in order to solve this case. 

According to an article in The Star, a Toronto newspaper, the police department in Toronto has DNA on the perpetrators for 30 cold cases. It is very likely that every police department is harboring similar statistics. Up until now, either in the US or Canada, you can only use that DNA profile from the crime scene to search genetic databases of known criminals. These are people who have already been caught and convicted. If your crime scene sample doesn’t match, you are back to square one. In both this new case in Washington state, as well as the Golden State Killer, these men had never been caught, and therefore their DNA was not part of these national databases. The only way DNA could be useful, is when it was compared to the general population, or in this case, a bunch of genetic genealogists who had uploaded their DNA results to the open sourced GedMatch. 

Lisa discussed many of the ethical and moral issues that we need to address as a community as more and more different kinds of uses for our DNA are found, and employed, and even commercialized. These are conversations we need to have as a community, and certainly that you need to consider personally. But like most technology, there are good sides and bad sides to advancements. One of the best upsides I can see out of this, is the feat of technology that took a small amount of DNA found at a crime scene 40 years ago, and turned it into a DNA profile that can be useful in genetic genealogy databases. For years I have disappointed many genetic genealogists that have letters and stamps and hats from their loved ones who have passed on, and they want a way to obtain their DNA. Well, now we have evidence that it can be done. You can take some genetic material (licked stamps or envelopes, hair with a root, razors, teeth), and use it to create a viable profile that can be used to search genetic genealogy databases! In fact, LivingDNA is currently openly accepting these kinds of samples, albeit at a hefty price tag, starting at $1000 or so per sample. 

Now, whether or not the DNA from that stamp, or that stray piece of hair in the hat will be able to produce enough DNA to provide a complete enough DNA profile, still remains to be seen. But I would watch companies like Parabon, and Living DNA, closely as they work to develp robust laboratory techniques that will provide answers for all of the genealogists whose parents and grandparents didn’t ever have a chance to spit to record their family history.  







Originally published on June 2018 on 

Diahan SouthardComment