NY police killings raise questions of cause and effect

Aired: 12/22/2014 | 0:07:51 | Clip
The murder of two New York City police officers has ignited a volley of blame and exposes the deep rifts dividing a city in mourning. Gwen Ifill gets two perspectives from Patrick Colligan of the New Jersey State Policemen's Benevolent Association and Mark Levine of the New York City Council.

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