The conviction on Tuesday of white policeman Derek Chauvin for the murder of African-American George Floyd in Minneapolis is not a frequent act of justice in the United States. Blacks are still the main victims of police violence. Will the call for US police reforms be heard? Professor at the Jay John College of Criminal Justice in New York, Dennis Kenney, doctor of criminology, was a police officer in Florida and advises numerous police forces across the country. He comments on the importance of the verdict.