Since the story broke in April, a number of people have asked me how it is the police could use the DNA of regular joes to crack a cold case. Its very simple- you go online, shout Go Go Gadget DNA KIT!!!! and voila!
Also, GEDMATCH.com and some basic knowledge of genetics helps. But mostly work on your Don Adams impression.
The New York Times article referenced in the video can be found at: https://www.nytimes.com/2018/06/27/science/dna-family-trees-cold-cases.html