Two Sussex Police officers who helped convict Sarah Payne's killer Roy Whiting are reviewing exhibits in the Soham murder case.
The move is to ensure the integrity of evidence following the arrest of two Cambridgeshire officers on child pornography charges.
A senior Sussex Police source said: "Our officers gained tremendous experience while working on the Whiting case and with the horrendous amount of work needed to present evidence and exhibits to court.
"They are passing on their expertise."
A Cambridgeshire Police spokeswoman said there had been no contamination of exhibits during the inquiry into the murder of Holly Wells and Jessica Chapman.
But she said: "Sussex Police have been invited to carry out an independent review of the exhibits.
"While we are confident of the work carried out to date, we asked for an independent review as an extra procedure to ensure the integrity of Operation Fincham.
"Two officers from Sussex Police are due to come to Cambridgeshire Police headquarters today to start their review."
PC Antony Goodridge, 34, an exhibits officer in the Soham murder inquiry, was charged last week with four counts of child pornography offences.
A second member of staff at Cambridgeshire Police, Detective Constable Brian Stevens, who worked closely with both the Wells and Chapman families as a family liaison officer, was also arrested and charged with child pornography offences.
Both men had been remanded in custody but were yesterday granted bail.
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