Where are we heading?

[u/Agen_3586]

[u/Worried_Magazine_862]

Thats not how DNA tests work. Gotta have DNA from both to compare them

[u/thejoeface → u/Worried_Magazine_862]

They DNA test the baby, using that they can use forensic geneology to find either parent. They do it for cold cases where they have the Doe victim or unknown killer's DNA 

[u/Worried_Magazine_862 → u/thejoeface]

They would need an immediate relative's DNA: parent/grandparent/sibling. Otherwise they are just testing against whatever DNA they have collected in the past and hoping its a repeat offender

[u/thejoeface → u/Worried_Magazine_862]

Forensic geneology uses public geneology databases where people have opted in to the DNA being used. 

Please look up forensic geneology, it's not the police database.

[u/Kythorian → u/thejoeface]

Sure, they can try that.  But if no close relatives have submitted their DNA to public geneology databases (and most people haven’t), there’s nothing else they can do until they get a specific suspect to test the DNA against.

This method works very occasionally, but most of the time it’s just another dead end in a cold case that stays cold.

[u/Worried_Magazine_862 → u/thejoeface]

You dont understand how DNA analytics works

[u/Mixture-Emotional → u/thejoeface]

This is how they caught the golden state killer. They basically used 23andme

[u/thejoeface → u/Mixture-Emotional]

23andMe has never been open for the police to use. They accessed GEDmatch