Police in Bristol spent more than £500 a night to house a notorious paedophile at their Portishead headquarters.
Francis Lee, formerly Robert Oliver, 52, was moved into a safe house at the HQ after it was revealed he was living at a bail hostel near a nursery.
Lee was jailed in 1989 for the manslaughter of Jason Swift, then 14.
The Multi-Agency Public Protection Arrangements (Mappa) board defended the decision to house Lee at the headquarters for four days in May.
A Mappa spokesman said: "£2,100 was spent on accommodating this individual.
"This was a temporary measure, made necessary in response to media coverage at the time.
"In such cases the Mappa has a duty of care firstly to members of the public but also to the individual concerned."
But Peter Saunders, from the National Association for People Abused in Childhood, said £500 seemed a "ridiculous" amount to spend: "You can stay in a top hotel for that. It's a hell of a lot of money.
"But if we have to pay that sort of price - which I find absolutely stupid - to keep our children safe then I'm willing to pay it."
The Mappa spokesman added: "Such individuals may have to be relocated as a result of further media coverage, which results in even more expenditure of taxpayers' money.
"There is also always a risk that individuals concerned in sensitive matters like this could be driven underground as a result of further media coverage.
"This could then mean there is a potentially-heightened risk to the public as the authorities would have no element of control whatsoever on where individuals are and what they are doing."