How a controversial type of warrant helped convict a former Arkansas police chief of a decades-old rape

DNA evidence has become a cornerstone of modern police work, be it through the use of genetic genealogy or submitting material found before modern advances in testing.

​ DNA evidence has become a cornerstone of modern police work, be it through the use of genetic genealogy or submitting material found before modern advances in testing. Read More Breaking News, Latest News and Videos | CNN