I've been wondering about that too and just tried to Google up an answer. NamUs does DNA samples and profiles, and has "DNA analysis" capabilities, and has some sort of automated matching capabilities for matching personal data, but doesn't claim to have the automaton to run DNA profiles against a DNA database of the unidentified. My guess is that they would be touting that ability if they had it.
I think that the kind of check you suggest make perfect sense, but I wounder whether NamUs is the right place to mount the kind of IT effort it would take to do that. I'd have thought that it would make more sense to have a Federally funded website that would run those kind of checks fast and well against a huge DNA database for NamUs and LE outfits across the country.
So, anyway, how do the matches get made? I stumbled upon one example from a recent article in the Democrat and Courier:
3 men tested for DNA match in Tammy Jo homicide
Gary Craig, November 10, 2016
"...Nowell connected with Alexander's sister, Pamela Dyson, and they then approached the Hernando County Sheriff's Office, which could not locate a missing person report for Alexander, who was last seen in Florida in 1979. Dyson provided a DNA sample, and information about Alexander was posted on the Department of Justice's National Missing and Unidentified Persons System, or NamUs.
NamUs includes information about missing persons or bodies that are found and unidentified. An online community, called
Websleuths, has worked for years to try to identify missing persons. When the information about Alexander went online, one of its members, Carl Koppelman of California, believed that Tammy's appearance matched that of the young woman found in the Caledonia cornfield, whose image had been circulated internationally.
He reached out to law enforcement in Florida. A Hernando County Sheriff's Office Detective, George Loydgren, was assigned cold cases and was the contact for the missing person case of Tammy Jo Alexander. Once he saw the photo of the girl found dead in New York, "I thought right away it was her," Loydgren said.
Dyson's DNA sample showed a familial match with the body found in Caledonia."