Scotland Yard's review of the Madeleine McCann case is a "ludicrous" waste of money, a senior member of its governing body has claimed.
Jenny Jones hit out at David Cameron's controversial decision to involve the Metropolitan Police and said the move would deny other victims of crime the chance of justice while using up valuable police resources.
The review has already sparked fierce criticism amid suggestion the intervention could undermine the independence of the force.
Ms Jones, a member of the Metropolitan Police Authority and the London Assembly, told The Mail on Sunday: "The police should not take this case up in this way.
"It is ludicrous. This could take years and will cost millions. It is very unusual for police to step in like this and it is not an appropriate use of police resources."
She said the MPA would now be asking tough questions of the move, adding: "The Government is closing down the Forensic Science Service because there are not enough funds. This is a crucial part of police work.
"Although it is tragic and I feel for the McCanns, how can the Prime Minister justify spending millions of pounds on one case?"
Her comments echo remarks made by fellow Metropolitan Police Authority member Lord Harris last week.
Writing on his blog, he said: "Whilst no one doubts the desirability of doing what can sensibly be done to find out what has happened to Madeleine McCann, I can imagine that the senior leadership of the Metropolitan Police are not exactly happy about this."
Madeleine went missing from her family's holiday flat in Praia da Luz in the Algarve on May 3 2007, shortly before her fourth birthday.