Eight Derbyshire police officers have refused to answer questions during an investigation into a man's death.
David Stokes, 31, was arrested on 19 April near Chesterfield but became unwell and died in hospital. The cause of death has not been identified.
The Independent Police Complaints Commission said the officers' decision only to provide written statements could undermine public confidence.
www.bbc.co.uk/news/uk-england-derbyshire-22705102