How discarded chewing gum helped convict a serial rapist of two cold case murders

A “gum ruse” led to a breakthrough in the investigation of two 1980s murders and showed how crucial modern DNA technology is in solving cold cases.

​ A “gum ruse” led to a breakthrough in the investigation of two 1980s murders and showed how crucial modern DNA technology is in solving cold cases. Read More Breaking News, Latest News and Videos | CNN