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An attractive nurse, Sherri Rasmussen, is murdered in her own home in 1986. There are few clues, except one: a bite mark containing saliva found on Sherri's arm. But it's of little use because DNA testing is not yet available.

  Digital security
'Apps act' would make privacy disclosure a must
With more than 1.5 million apps now available for Android phones and Apple's iPhone, a congressman is proposing a law that would require mobile app developers to let users know what an app's privacy policies are when it comes to information being shared and the length of time the information is kept by a developer.

Video: Crime & courts  
Dallas 911 operator breaks silence on Deanna Cook case
Tonyita Hopkins breaks her silence on answering the chilling 911 call in which Deanna Cook is heard pleading for her life. Hopkins describes a 911 call center that was short-staffed and overwhelmed and reveals her surprising personal history that draws parallels to Cook. Kate Snow reports.

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