A law enforcement source familiar with the matter
told CNN that police found unknown DNA at the scene of the killings. However, the DNA didn't match anything within the police system, so police utilized genealogical techniques. The
unknown DNA was run through a public database, which identified relatives of the suspect.
snip
California investigators were able to take DNA from a crime scene and use a public DNA database to trace it through his relatives and back to him.
Police reportedly identified the suspect in the fatal stabbings of four Idaho students through genealogy. A law enforcement source familiar with the matter told CNN that police found unknown DNA at the scene of the killings. However, the DNA didn't match anything within the police system, so...
www.washingtonexaminer.com
How does genetic genealogy work?
Genetic genealogy uses autosomal DNA single nucleotide polymorphisms to discover recent common ancestors between two or more people. This is done by examining the SNPs on your chromosomes and comparing them to other people's chromosomes. If two people share a long stretch of DNA, it is likely they share a common ancestor.
I knew if this a conservative website, public DNA is not a source entailed by privacy. I don't care what the article says, unless they
find DNA at the scene of the murders he can't be tried for murdering anyone.