Work in tackling domestic violence in Norfolk and Suffolk has been praised by the head of the Crown Prosecution Service.
Norfolk and Suffolk police have been singled out by director of public prosecutions Kier Starmer QC.
He praised their "best practice" work in gathering early evidence at the scene and using 999 recordings.
Norfolk is one of the few forces in the country to routinely provide recordings of 999 calls for prosecutors.
High conviction rate
Mr Starmer said in a speech on Tuesday that he was impressed with the success of the two forces' approach.
"In one recent Norfolk case... a defendant was convicted when the 999 tape was played in court and the victim could clearly be heard in a distressed state in the background," he said.
"Suffolk has also successfully used photographs in one case to prove reddening to a complainant' s neck, corroborating the claim of her being choked.
"This was critical because by the time the scene of crime photographs were taken the reddening had faded."
In Suffolk the conviction rate for domestic violence is 84%, 12% above the national average. In Norfolk it is above 80%.