An American diplomat who was driving on the wrong side of the road when she caused a fatal car crash "could and should have been arrested", a review has concluded.
Motorcyclist Harry Dunn, 19, died in 2019 after being hit by a car driven by Anne Sacoolas, who weeks later left the UK under diplomatic immunity laws.
An independent report has criticised Northamptonshire Police's handling of the investigation, with Mr Dunn's family saying they had been "failed by the very people we should have been able to trust".
Northamptonshire Police has apologised, saying it failed "to do the very best for the victim".
Mr Dunn died as a result of injuries suffered when his Kawasaki motorcycle was hit by Sacoolas's car outside RAF Croughton in Northamptonshire on 27 August 2019.
