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
Durham Police have released CCTV images of a failed robbery in Kelloe and are appealing for information.
400 bales of straw, a tractor, trailer, fertiliser spreader and a bin of grain were engulfed in flames and completely destroyed.
Last night hundreds of people turned out for the official opening of Sunderland's new Fire Station arts hub.