On 29 April 2018 at 14:59, Matt Lawes <matt@insysx.com> wrote:
I think this is bad journalism not bad police protocol. The article I read described a second rape kit that had been collected
Again, I might be wrong here. But my understanding is that we have 3 relevant sets of DNA.
1) Suspect's DNA.
The kits would have been used to collect and preserve the DNA of the suspect. Presumably it's uncontroversial that this DNA can be collected, stored and tested.
2) Relative's DNA.
(Again I am assuming...) That a relative of the suspect had voluntarily uploaded DNA data from a service like 23andme (looking at GEDmatch.com it seems to support Ancestry, FTDNA, WeGene, MyHeritage and "generic") which provides matches against relatives. I assume this was done with the consent of the relative
The site notes:
"April 27, 2018 We understand that the GEDmatch database was used to help identify the Golden State Killer. Although we were not approached by law enforcement or anyone else about this case or about the DNA, it has always been GEDmatch's policy to inform users that the database could be used for other uses, as set forth in the Site Policy ( linked to the login page and https://www.gedmatch.com/policy.php). While the database was created for genealogical research, it is important that GEDmatch participants understand the possible uses of their DNA, including identification of relatives that have committed crimes or were victims of crimes. If you are concerned about non-genealogical uses of your DNA, you should not upload your DNA to the database and/or you should remove DNA that has already been uploaded. "
It seems that the Police/FBI created a profile on GEDmatch using the analysis of the Suspect's DNA collected historically. The GEDmatch service provided a list of people who were relatives of the Suspect, and using that information, along with their original profiling of who they were looking for, they identified DeAngelo as a potential suspect, so he was put under surveillance.
3) DeAngelo's DNA.
During the surveillance operation, DeAngelo discarded items which the officers collected. From the DNA obtained from these items (DeAngelo's DNA) they were able to determine using standard forensic DNA techniques that DeAngelo's DNA matched the Suspect's DNA. He was arrested.
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