This would be funny but for the appalling nature of the crime involved.
The Moors Murders. A young couple abducted, tortured, raped murdered and buried a number of children. They buried them on moorland and some have never been found.
The woman is now dead, but the man has some photos which may help the families find the graves, but

The police can not get a warrant to search his cell.

Could this happen anywhere else?