Derek Chauvin Trial Latest Updates: Prosecutors Put Focus on Use of Force Several law enforcement officials have testified for the prosecution, although the defense may benefit from an acknowledgment that bystanders can influence officers. Derek Chauvin trial: Use of force expert to testify on former officer's knee on George Floyd's neckThe expert is returning to the witness stand on Wednesday George Floyd: Expert witness criticises use of force during arrestSgt Jody Stiger testified that "no force" was necessary once Mr Floyd had been placed in handcuffs. Live updates: Chauvin trial resumes after police chief condemns officer for ‘absolutely’ violating policy while restraining FloydThe trial continues Tuesday after Minneapolis Police Chief Medaria Arradondo condemned Chauvin’s use of force on May 25, saying it “in no way, shape or form is anything that is set by policy.” George Floyd death: Seventh day of Chauvin murder trial beginsA Minneapolis Police Department training officer testifies on crisis intervention and de-escalation. A "remarkable move": Minneapolis police chief expected to testify against Derek ChauvinHe'll tell jurors that Chauvin's "conduct was not consistent" with MPD training and policies. Derek Chauvin trial: Rare testimony from Minneapolis police chiefIn a rare move, the Minneapolis police chief is giving evidence at the trial of a former officer. It was 'unnecessary' to kneel on George Floyd's neck, US court hearsKneeling on George Floyd's neck was "totally unnecessary," the head of the Minneapolis Police Department's homicide division testified on Friday.