When BTK started killing, using DNA evidence wasn't the norm. But 20 years later, tiny traces of DNA left on his first victims could be enough to bring him to justice.
Used to nab a serial rapist terrorizing a small English town and to identify one of America's most notorious murderers (the ruthless BTK Killer), DNA profiling has redefined forensic investigation. As science evolves, the ability of genetic profiling to help solve homicides continues to grow. Witness two landmark cases in the history of genetic profiling as scientists and detectives involved in ground breaking cases usher in a new age of forensic science.
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