The police watchdog, the IPCC, has upheld a complaint that a Cleveland Police officer punched a man.
The man in his forties was arrested at home in Hartlepool last year.
He also said police went through his mobile phone to stop him filming the incident.
The officer involved will face a misconduct meeting, and the force has been asked to look into whether the man was wrongly arrested.
More top news
Paul Brand and guests - including new North East MPs Anne-Marie Trevelyan and Anna Turley - discuss the Labour/Lib Dem leadership campaigns.
A look ahead at the forecast for the Tyne Tees region.
Health services that dealt with a double murderer should have identified the probability that he would re-offend