You're correct that private genealogical databases have to get consent from participants before they will share any DNA records.
The difference between them and IGG (Investigative Genetic Genealogy) is that IGG is a traditional forensic database that maintains DNA records of those who have been tested in the process of being arrested or have consented to have their DNA in the database.
But LE would not have used IGG in this case (JMOO) because they only needed to test the DNA they found in the family trash to the sample on the sheath. In this case, they were just looking for a match because they already had the DNA from the sheath.
This is an odd case. A lot of things don't make a lot of sense in this case.
This is a little inaccurate. Only CODIS and other LE-based data bases have the results of the limited testing of felons. Florida apparently plans to take DNA from every person who is arrested, whether they are convicted or not - this will obviously involve massive constitutional issues for Florida down the road, as it begins to use this database.
However, an IGG company like the one used in this case (Othram is an example, there are others) has its users upload DNA
with consent to use by LE agencies. Everyone must state that they have read the terms of service and
agree to have their DNA records used to find criminals or identify missing persons.
IGG's are
not traditional. They are relatively new. The GG stands for Genetic Genealogy (which I teach and do). It combines our knowledge of someone's genes with the use of documents such as birth and death records, census records, migration and transportation records. Combining the genealogy and the genes (often by using the Y chromosome or mitochondrial DNA markers), we can trace a person's ancestry very far back into time.
I guess I should add that I don't consider 6 years long enough to be a tradition (just a personal opinion). Othram is about 6 years old; Gedmatch went forensic just 5 years ago. I'm sure there are a bunch of others by this time - and the technology will only get better (already has, is resulting in amazing ways of using DNA for many technologies, not just forensics of course). But it's new. CODIS is old.
The question is: How would LE have found the Kohberger household in the first place? They had only DNA of an
unknown person. How would they have known to go to PA? They had one DNA sample out of 150,000,000 American males. A needle in a haystack. No test on an unknown sample of DNA brings up a name or an address (it can bring up a face though -
www.parabon.com exists - but if you go there, you see it's not a viable way of finding 1 person out of 150,000,000 - although the tech is getting better).
DNA does not come with a label as to who provided it - that comes from a swab and then a match in a database.
Step one: Find DNA that is possibly that of a perpetrator (sheath DNA in this case)
Step two: Run it through the LE databases to see if it's a known criminal (CODIS) (no matches in this case)
Step three: Run it through a forensic IGG to see if any relative of this person has submitted. (the name Kohberger was one of two close matches - but not Mr Kohberger, Bryan's dad - but it gave them reason to go through Kohberger family trash in PA, which is legal).
They were lucky that a Kohberger (for whatever reason)
decided to put their genetic profile in a database. Interestingly, these same sites ask people to give the name on their birth certificates, as well as married names or other names they might go by.
So it's even possible that the donor was BK's own sister. And if so, what a bombshell that would be for the family if the Court allows it to be revealed to the public record (after the trial, the records will all be unsealed).
Interesting to think about, for sure.
Here's the link to a forensic database that reconstructs faces:
www.parabon.com
It also has started doing IGG, it's an opt-in forensic online genetic genealogy database (internet-based genetic genealogy, IGG). It's worth a look.
Phenotypic reconstruction
Genetic genealogy
And here on Websleuths, we have a whole forum devoted to the amazing work of
Othram.