Paula Zahn Gives ‘Investigation Discovery’ Highest-Ever Rating

By Alex Weprin 

A new episode of “On the Case with Paula Zahn” Sunday delivered the highest rating ever for the Investigation Discovery network. The program also gave ID its best primetime performance ever in both total viewers and adults 25-54. “On the Case” drew 936,000 total viewers, including 527,000 A25-54

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