A police trainer has testified that ex-officer Derek Chauvin was not trained to use his knee in a neck restraint as he did during George Floyd’s arrest.
Minneapolis use-of-force expert Lt Johnny Mercil said Mr Chauvin should also have later moved the prone Mr Floyd to a different position.
Mr Chauvin was filmed kneeling on Mr Floyd for over nine minutes during Mr Floyd’s arrest last May.
Mr Chauvin is on trial for murder and has denied the charges against him.
The footage of Mr Chauvin, who is white, with his knee on African-American Mr Floyd’s neck sparked global protests against racism.