This episode contains descriptions of violence. The death of Tyre Nichols, a 29-year-old Black man, at the hands of officers in Memphis last month has intensified calls for fundamental reform in policing. Those calls were echoed yesterday by President Biden, who hosted Mr. Nichols’s parents at the State of the Union address. Today, we hear about a Times investigation into the special team of officers, known as the Scorpion unit, that is accused of killing Mr. Nichols. Guest: Mike Baker, the Seattle bureau chief and a national correspondent for The New York Times.