The Smithsonian Channel debuts a new true crime series tonight, this one looking at the forensic science investigative tools that have revolutionized the way criminals are caught.
"Forensic Firsts," airing at 9, kicks off the series by examining the history of DNA evidence. They revisit the rape and murder of two girls in Leicestershire, England in 1986, the case that was the first in the world to use DNA evidence against suspects.
The episode mostly talks about the case of the BTK serial killer in Witchita, Kansas, who began killing in 1974 before the technology was in use. But DNA is what finally -- eventually -- got Dennis Rader in 2005.