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Erin Moriarty previews her "48 Hours" story Stalked

An estimated 7.5 million Americans are stalked every year. Actress Pauley Perrette from CBS' "NCIS" has become an advocate for tougher laws against stalking. "48 Hours" correspondent Erin Moriarty looks at the women who are fighting to save lives, and she joins CBSN with a preview.
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