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Police officer testifies against officer who killed George Floyd


On the fourth day of the Chauvin trial, Chauvin's former supervisor took the stand and testified his restraint of George Floyd violated use-of-force policies. Chauvin is on trial charged with second-degree murder in connection with the death of George Floyd. MSNBC's Ari Melber breaks down the proceedings, reports on the paramedics who arrived at the scene, and discusses the emotional testimony from George Floyd's girlfriend.