A former Sussex Police officers appeared at Portsmouth Magistrates' on Tuesday (April 26) to face a charge of assault against a juvenile in Chichester.
It happened on April 26, 2001 and involved a girl who had been arrested and was in police custody at Chichester.
Ian Cheesman, 53, who has since retired from the force, was a sergeant at the time and was suspended from duty.
The case was referred to the Independent Office of Police Conduct who directed that a local investigation by the Professional Standards Department should take place.
He pleaded not guilty to the offence, but was found guilty and sentenced to a 12-month community order, 50 hours of unpaid work and ordered to pay £750 costs.
Detective Superintendent Rachel Carr said:
"Sussex Police expects the highest personal and professional standards of anyone who works for us. The force's Professional Standards Department will now consider misconduct proceedings following the result of the court case."
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