Jelani Cobb discuss new PBS 'Frontline' documentary 'Policing the Police 2020'

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PBS "Frontline" Correspondent and staff writer for the New Yorker Jelani Cobb joins Andrea Mitchell to discuss the new documentary "Policing the Police 2020" that looks at police reforms in Newark, NJ over the last four years after the police there were found to have disproportionately targeted minorities.