In 1997, a nine-year-old Ohio boy was sexually assaulted, but his assailant could not be found. Using genetic genealogy, a recent tool for tracing family histories through DNA, Cuyahoga County prosecutors, aided by researcher Barbara Rae-Venter, were able to solve the nearly-three-decade-long crime.
https://www.cbsnews.com/video/cracking-the-code-the-hunt-for-sexual-predator-john-doe-147/