Fox News said that the Authority found the Killer by comparing his DNA with the Public Data on Gedmatch.
No abuse of privacy took place and a Search Warrant wasn’t needed.
“.... Authorities' biggest tools was GEDMatch, a Florida-based website that pools DNA profiles that people upload and share publicly, Paul Holes, one of the team’s top officials, told the Mercury News on Friday. ...”
http://www.foxnews.com/us/2018/04/27...ting-site.html