Michael Perkins, 49, a road policing officer based at Chichester, appeared at Hastings Magistrates' Court charged with common assault and a public order offence.
He was found guilty of common assault against a woman prisoner he was transporting to custody in November 2011 after she had been arrested on suspicion of drink driving. He was fined £495 and ordered to pay £900 costs. He was found not guilty on a charge of using threatening words or behaviour.
More top news
Lucy Verasamy has the latest forecast for the west of the ITV Meridian region
Lucy Verasamy has the latest forecast for the east of the ITV Meridian region
Two thieves have been caught on camera searching through belongings during a burglary at a Kent home