Charles Campisi joins us to discuss his book Blue on Blue: An Insider’s Story of Good Cops Catching Bad Cops. For nearly 20 years, Campisi led the NYPD Internal Affairs Bureau, known among patrol officers as "the rat squad." He worked to change the reputation of the bureau while also improving techniques to catch and punish corrupt officers who stole drugs, or used excessive force. He discusses infamous cases in detail, including the violent assault of Abner Louima and the shooting death of Amadou Diallo.