Not how DNA analysis works
They can’t track him down with just that they need to compare it to a blood or spit sample
Police can request your DNA from sites like Ancestry, 23andMe
FamilyTreeDNA is sharing genetic data with police. Here’s what that means for you
But FamilyTreeDNA has granted police permission to upload data from crime scene DNA and search the company’s more than 1 million records to look for relatives of potential suspects. While some people support the company’s effort to help catch suspected rapists and murderers, privacy advocates and some customers of DNA testing services are alarmed by the idea that police could poke around in people’s genetic data. Here’s what the announcement really means.
What genetic information can law enforcement access?
Police are interested in determining how much DNA people in the database share with genetic samples from crime scenes. Genealogists can then use the closest matches possible to build family trees and identify a likely suspect.
The process is similar to looking at someone’s LinkedIn profile to see who is in the person’s social network, says Melinde Lutz Byrne, a forensic genealogist at Boston University who is involved in helping law enforcement solve rape and murder cases.
FamilyTreeDNA’s Gene-by-Gene laboratory has “processed a handful of cold cases for the FBI,” company president and founder Bennett Greenspan said in a letter emailed to customers on February 3. Those FBI investigations are being conducted on behalf of other law enforcement agencies to find suspects in violent crimes and to identify remains of deceased people.
But that doesn’t mean law enforcement has unfettered access to customers’ DNA. Police can see data only from people in FamilyTreeDNA’s database who are a genetic match with those crime scene samples. Law enforcement “cannot search or ‘dig through’ FTDNA profiles any more than an ordinary user can.” For any additional information, police would need a warrant or subpoena, the letter said.
People are snitching on their entire family tree when they take DNA tests provided by these companies. Law enforcement doesn't even need a 1:1 match , a familial match will narrow their search drastically and from there it's just a matter of looking at the region the mail originated from and profiling nearby males of appropriate age within said family tree to identify the suspect.